Champion Cutting Tool 705C-1/4 Cobalt 1/4-Inch 135 Degree Split Point HSS HD Jobber Twist Drill Bits, 12-Pack

These are some substantially high quality drill bits. They hold their shape and don't bend under high rpm which allows for very high precision drilling. I'm actually using these to make custom circuit boards for a zilog z80 computer build which requires an incredibly fine level of precision.They don't break very easily but can get slightly bent fairly easily. This may not even be a problem if extreme precision isn't a concern for you. Luckily, they're quite reasonably priced for what I'm doing so if you have hundreds of holes in a plastic circuit board to drill and need high precision like me, get yourself 2 or 3 packs.

I really like these Champion bits. I own several sizes in this brand and style and I find them hard to beat. They seem to last forever. They are very brittle, but I mainly use a drill-press. I'll at least break one every time I use a hand drill if I am drilling a hard material.I am very pleased with them and will continue buying them.

I put this bits to the test on a project with some scratch resistant steel and steel alloy materials. These bits did the job very well. I will order these in the future for other projects

Drilled out 2 broken bits using this Cobalt bit. Used different cobalt bits but these are the only ones that worked

Good for drilling stainless steel. Whenever I tap holes in steel I use my #8-32 tap to standardize on a screw sizes, and I use these drill bits to drill the holes. Because there is 12 of them, I can break one and not worry. Very cheap price for the amount of cobalt bits.

took a while to get here but good

Good quality drillbits from Champion Tools.It drilled through Incolonel 625 bars easily. Highly recommended.

I used these drill bits to drill holes in homemade circuit boards and they worked very well. They are quite tough for their small size.