5/32 Inch Cobalt Drill Bit Set, M35 Jobber Length Twist Drill Bits,Suitable for Drilling in Hard Metal, Stainless Steel, Cast Iron,10 Pieces

These bits came really sticky, cleaned them up and was blown away. These are the sharpest, most aggressive cutting bits i've ever used. I used these to bore out some existing 1/2" holes in 1/4" A36 mild steel, the first hole I drilled like I do with Bosch M35s and it immediately grabbed and sucked the bit through in one second what typically would take 15-20 seconds of effort. Because of this, the sides of the flute took some noticeable scuffing but nothing that impacted the cutting ability. Once I developed a lighter touch with these they became amazing bits. Even was able to ream out final fit holes through 2x 1/4" steel plate with 2.75" of plywood in the middle with no problem. If your using these with steel make sure to get some Tap Magic and use judiciously. Then hang on for dear life and try not to let the flutes bite and gouge or you will be hurting. Not 100% sure about long term durability but I drilled 8 holes in the aft mentioned steel plates then reamed them out with the same bit, no signs of dulling yet but the finish did start wearing off. Didn't use the second bit yet. For the price these can't be beat.

only had one job to do work great

Great product very sharp and long lasting

The first one would not drill a hole in the steel the second one drilled 4 holes Farley good keep in mind I’m drilling into farley hard steel

I only buy cobalt drill bits now. Cobalt is the material that is durable enough to hold up well no matter what I'm drilling through. (Even stainless steel.) These drill bits are no exception to the other cobalt bits I have. They come in a nice package so you can find the right diameter when you need it. They remain sharp after several uses too.

I bought these and an alternate brand for drill 12 holes through thick plate steel. The other brand (which had a piloting tip) took 2 bits to complete one hole. Ugh, I thought my project was going to be a problem. After the 2 bits of the other brand were done, I switched to this one. Wow, 11 holes with these 3 bits, no problem!!! I could have drilled a few more holes. Lots of value here!!! Strong cutting bits!! works great with cutting oil.

I built a 6ft high, 24 ft fence using only one drill bit! Worth the price.

Item as described and fast shipping. Thanks!

Très bien merci

Muy bueno, se adapto muy bien al taladro y muestra buena durabilidad. Hicimos un ojal en tarja de acero inoxidable. Vienen dos en su estuche y bolsa cada una

Excelente producto

Percer