K1 Pro Professional Cutting-Edge Brushless Motor Advanced Rock Tumbler Polisher Kit, Large 2.5Lb Barrel with 3-Speed & 9-Day Timer, Includes All Accessories, Ideal Gift for Adults & Collectors

I bought it because I wanted an at home option to polish rough rocks into smooth gems without sending everything to a workshop. The extra-large 2.5 lb barrel and a 9-day programmable timer sounded perfect for longer cycles and batching several stones at once. In everyday use, setup was straightforward. I load the rocks, four grit packs, and ceramic media, seal the leak-proof lid, pick a speed and start. The three speeds and the brushless motor make it feel responsive, and the drum runs smoothly and quietly compared with older machines. What clearly stands out is the four-stage grit system that yielded a clean, museum-like shine after a couple of cycles. The soft rubber barrel seems to absorb impact well, and I appreciate how much less noise it makes during operation. The included instruction book and extra belts and grit packs were helpful in getting started. One small caveat is that it takes a bit of practice to dial in the timing and grit order for different rocks, but once you get the rhythm it becomes predictable. Overall I’m impressed by the capacity, quiet operation, and consistent results, and I’d give it five stars.

Alright, rock enthusiasts and aspiring geologists, gather 'round! I recently acquired the KomeStone K1 Pro Professional Cutting-Edge Rock Tumbler, hoping to transform my collection of backyard pebbles into sparkling treasures worthy of a museum (or at least, my mantelpiece). This machine is, indeed, cutting-edge... or at least, it cuts through the rough edges of rocks with impressive dedication. It's like a tiny, geological spa for your stones, giving them the smooth, polished glow they've always dreamed of. My rocks are now so shiny, I'm pretty sure they're starting to develop egos. The "professional" part? Well, it certainly sounds important, and it feels pretty robust. It hums along, doing its thing, turning mundane rocks into mini works of art. I've spent an embarrassing amount of time just watching it spin, mesmerized by the slow, steady transformation. It's surprisingly therapeutic, almost like a lava lamp, but with more potential for bling. My only minor quibble is that I now have an overwhelming urge to collect all the rocks. Every walk is an archaeological dig, every pebble a potential masterpiece. My pockets are perpetually full, and my family is starting to eye me suspiciously when I bring home yet another bag of "future gems." This tumbler is so effective, it's turning me into a rock hoarder. So, if you're looking to polish your pebbles (and perhaps your patience), the KomeStone K1 Pro is a solid investment. Just be warned: you might develop a serious case of "rock fever." It's a gem of a machine, and I'm totally rocking my new hobby!

I ordered this on impulse as my daughter had a national geographic tumbling kit. That one is mediocre at best, however I've always wanted to have one. So, I bought the pro K-1 brushless, and I'm impressed with the rubber basin and how airtight sealed it is. Works incredibly well! Functions are simple to use. Great storage capacity also. The instructions are detailed, easy to understand, easy to follow through. They provide two extra pulley belts for the machine. A screwdriver to pop the lid, as the lid recesses into the rubber basin. There's another lid that goes over that with a butterfly style handle/screw. I have mine set up in my shed, as it's much quieter than the previous rock tumbler I experimented with. This one is awesome because it has a built-in timer that sets how many days you would like to tumble the rocks. The instructions have guidelines and suggestions. And then it also has the speed ratio. There's a pause/play button, so if at any time you want to check on the progress of your tumbling, you may do so and press pause and not lose your day counts by powering it off. This kit comes with grits, step 1- thru 4. They're one time use. KomeStone has grit kits available to purchase and reasonably priced for future tumbling sessions. I'm obviously on day 1, but I'm excited to check back in a few days. Not sure if Amazon allows for video updates or anything of that nature, but I'll try if it allows.

Tumbler is working again after getting a new base. The design looks great. Being a 2 1/2 pound tumbler it is great for small rocks. Looking forward to the final product.

The tumbler was exactly what I was hoping for to have fun tumbling the stones that my son and I mine together. The stones that came with the tumbler were very nice as well. The instructions were very clear and easy to follow, along with the equipment actually being easy, but seemingly good quality. The drum seems well designed with good durability, I have not had any leaks. For some reason, the tumbler base malfunctioned after about 2 weeks of use, where the motor stopped working. I reached out to the manufacturer and I'm not exaggerating when I say they were top notch in their response. The reply was very fast, with clear questions and instructions on what they needed from me. I was busy for a few days and took some time to send them my info, and they checked up to make sure I didn't need any help getting it to them. They shipped a new base within 24 hours and it arrived next day shipping. Once I received it, they were very concerned to make sure I received it, the new one was working properly, and I was 100% satisfied with how they resolved the issue. They sent me an email every few days to ensure I didn't have any issues until I got back with them (I wanted to let it run for a week cycle to make sure it was good to go). In addition to the new base, they issued me an additional one year warranty on the replacement. I'm not typically one to go into in depth reviews, but they honestly deserve it, even just for the amazing and friendly customer service, then a very nice tumbler for hobby use. I was already debating possibly upgrading to the larger one in a few months, and I am sold on it now.I will be buying my extra grit from them after this experience, instead of browsing for other sellers. I know that if I'm not satisfied, they will go above and beyond to change that.

We've only been using this rock tumbler for about two weeks now, but so far so good. It comes with everything you need to get started, and the only thing you'll need to buy more of are the grits. The rocks that come with it make a great first batch for tumbling, and we're already seeing great results in the middle of the second stage, and can't wait to see the final product. Customer service has been very responsive and friendly, and if you just email them your order number and address they'll send you a bunch of replacement bands for free (I guess these get worn out after turning the barrel for weeks). The two things to watch out for are the noise it makes - there's absolutely no way I'd let this thing run in the same room, or even the same floor we spend most of our time in. We set it up in our laundry room, which is in the basement, and it's manageable there. If we lived in an apartment or a smaller house, I'd be returning it. It also vibrates quite a lot and as a result, it slides across the surface. After trying a couple of different things to keep it in place, we now have it surrounded by heavy weights to keep it in place. It does have small rubber feet but they don't prevent it from sliding, at least not on our smooth countertop.

I end up with a lot of old hardware and small bits and pieces that come from garage sales, cannibalized equipment, etc. I also restore old tools, work on old cars and motorcycles, etc. I wanted a small tumbler so that I could drop a handful of fasteners or small parts in, let it run for a while, and come back to clean metal. This was a complete shot in the dark. I usually soak parts in vinegar or phosphoric acid when they're rusty, and that works well enough that I wasn't sure if tumbling would work better or be less hassle. On the one hand, there's no acid to neutralize and not much pre-cleaning that has to be done. On the other, you have to deal with abrasive grit, which can get everywhere (and I mean EVERYWHERE). Since I didn't know if I'd like this approach, I didn't want to risk a lot of money on a tumbler. I bought this kit because it was inexpensive and had decent reviews. If this ended up being an essential part of my workflow, I decided that I could always buy something bigger and/or better in the future. So far, this tumbler has been awesome. The first batch of parts that I threw in was a rusty mess of hardware that I'd picked up at a garage sale. This stuff probably hadn't seen the light of day in decades and had a pretty solid layer of rust on it. I skipped the included media and instead filled the tumbler drum with medium (70 grit) aluminum oxide, which is a pretty aggressive grit used for media blasting. I'm not a fan of membrane buttons or plastic construction on most things because I haven't found it to be particularly durable, and this tumbler has both. It certainly doesn't look heavy duty and I didn't expect much out of it. In reality, I didn't even think it would have the power to turn a drum that was chock-full of steel hardware and abrasive, but I gave it a shot. I was pleasantly surprised that the drum started turning effortlessly even at the highest speed. Most of the hardware had settled to one side so the load was imbalanced and the tumbler started to walk across my workbench, but I propped it in place with a heavy box and let it run. After about an hour I checked on the hardware and almost all the rust was gone. I dumped the contents of the drum through a strainer, which made separating the hardware a breeze. What was left was almost completely clean steel, certainly clean enough to use once I blew the last of the grit away with an air hose. I ran a few more handfuls of hardware through this machine with the same results. I also ran a really cheap set of rusty no-name sockets that I bought at (yet another) yard sale. I keep junk sockets around in case I need to modify them for odd sizes or special uses, and these followed me home to be added to the "just in case" pile. The sockets came out fairly clean. The chrome plating is peeling off and while the tumbler knocked off any rust and loose bits of plating, it didn't take everything down to bare metal. That's fine, however, because it did most of the dirty work for me while I was doing something else. I can always give one of these sacrificial sockets a once-over on the wire wheel if I need to weld or modify it, but at least I'm starting with something relatively clean and rust-free. If you tumble steel parts or hardware, just remember that what comes out will be prone to re-rusting pretty quickly. This is because you've abraded off any protective oxide layers that were on the metal. It's a good idea to blow off any remaining media and then oil the metal to protect it. Also be aware that touching the raw metal with bare skin can cause it to rust faster, as the salts and acids in your perspiration all cause oxidation. I usually wear nitrile gloves in the garage so this isn't much of a problem for me. When I pulled this dainty little thing out of the box, I figured it would be good for a couple of uses at best before the motor burned out or something broke. So far I'm pleasantly surprised. It's put in a few hours of work with no complaint and nothing broken, and it does a good job of removing light to moderate rust. The aluminum oxide is a worthwhile investment (I think I paid $20 for 25 pounds or so, and I could've gotten a way better deal if I'd shopped around). Long term durability is still a question of course so we'll see how that goes, but so far this thing punches above its weight.

I used to have a rock tumbler years ago and always enjoyed polishing up stones I found. Lately, I’d been thinking about getting back into it, and after reading the reviews for the K1 Pro Professional Cutting-Edge Brushless Motor Advanced Rock Tumbler Polisher Kit, I decided to give this one a try. I’m so glad I did! After just one tumbling cycle, I already had enough polished stones to start a small collection—and to use in craft projects, home decor, and even a few handmade gifts. The possibilities are endless, which makes the whole experience even more fun and rewarding. I’ve completed three cycles so far, and it’s fascinating to see how much the rocks transform. I usually start with stones of different shapes and sizes, and once I see how they turn out, I decide what to do with each one. If nothing specific comes to mind, I display them in a pretty crystal bowl—they’re beautiful all on their own. Compared to the tumbler I had years ago, this model is quieter, easier to use, and impressively well made. The brushless motor is strong, and the kit includes everything you need to get started. I have no complaints—it’s a solid, high-quality machine that makes an old hobby feel new again. I highly recommend it!