abuff 10 Packs of Heavy Duty Wedge and Feather Shims, 5/8 Inch Plug Shim and Wedge Concrete Rock Stone Splitter Hand Tools

I bought this after seeing how to do it on YouTube. I had to split a sizeable granite rock in the garden that was in the way. With a row of holes drilled at approximately 100 mm distance and the depth of the feathers, it did not take more than four or five relatively gentle taps with a small sledge hammer before the crack appeared and the stone split. I am very impressed with the method and also with the product that did exactly what I hoped for.

These work great, what else can I say? Drill your 5/8" holes, pull the wedge out a bit, almost to the top of the feathers, then drop the feathers into the hole up to the rubber ring and get to hammering. Alternate hitting different wedges when you hammer them in. Eventually you'll hear the crack start to propagate (such a satisfying sound), then you keep hitting the wedges and the rock just falls in half. If it doesn't split after they're hammered in, give it a little encouragement with a pry bar or heavy hammer, it'll split, promise. Just make sure to wash and oil them after you're done to prevent rust. OH YEAH! One more thing, make sure to keep the wedge IN the feathers when you put it in the hole. Without the wedge in there, the rubber ring isn't enough to hold the feathers in place, and they'll drop into your hole and you won't get them out unless you have a magnet wand or you split the rock. Learned that one the hard way.

I’ve split a lot of rocks with these. I did break one already but because it’s a ten pack I’ve got lots left.

I was very impressed with the overall look and feel of the shims.. Though haven't yet tested the relative merits of the steal.

They work, just not as easy as all the YT videos make it out to be, but I got the job done. make sure you're working area is somewhat clean, because the wedges and rubber band that holds them can go flying when they fall, and can be quite hard to find again at times.