M35 Cobalt Drill Bit Set 20PCS(1/16"-1/2") High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal with Index Storage Case

Worked perfectly. Easily drilled out broken stuck bolt.

Solid drill set with high quality materials, did some furnishings and the bits drilled right through 2x4s without an issue, tackled some 1/16 and 1/8 plates and was able to cut through quickly and precisely, performed as expected of cobalt tips

Use cutting oil on stainless steel. The first bit only lasted for 2 holes, forgot to use oil. The next bit, using oil, drilled about 56 holes without dulling.

Great price for steel drill bits, I don't have to borrow my neighbors anymore

I haven't used it yet but it looks like nice quality 👌

These are really good bits, drill through engine blocks easily. (4 inches through an engine deck for an additional oil passage for the cylinder heads on V8 once on each side and the bit was sharp as new afterward). Using regular bits it would have taken several new bits for a single hole. With these you could probably drill ten holes before it was too dull.

Very nice drill bits drills holes fast

Broke two within 20 minutes of using the set. I'm a window installer, was drilling out stripped screws trying to take the head off so I could snap apart an aluminum frame. One bit broke on the first use. I know I'm using them in a way that is prone to damaging tools, which is why I usually just deal with it and buy more. But I have used a lot of bits in this way and they typically hold up much better than this. Primarily they go dull, they don't snap within two seconds of use. Would not buy again.Update: I used them for a second day and they're worse than I thought. I broke two more and I was just drilling into regular aluminum. They go dull after drilling one or two holes. Definitely would never buy again.