3/16 Inch Cobalt Drill Bits – 5pcs Drill Bits for Metal, M35 Cobalt Metal Drill Bit Set, Pilot Point Tip – Heavy-Duty Drill Bits for Steel, Hard Metal, Cast Iron (3/16" x 3-1/2")

Used one bit to drill 40 something holes to bolt boards down to a thick steel trailer. That bit is still ready for more.

I did not measure how close they are to the nominal size, but they are well made and sharp.

No issues. Drilled thru RV I beam like it was nothing. I would buy again.

These were very sharp and cut through mild 5/16 steel with ease. The downside is they are very Brittle. They work perfectly in my drill press for normal drilling. I use these for horseshoes that sometimes need to have a rectangular hole enlarged. While drilling round holes in a rectangular opening is not ideal, nor their intended purpose, its often what I need them for. Other brands took my abuse with less breakage. Even with a good lubricant i snapped bits. Needs a light touch but ok for the money.

This bit has a “starter” tip that allows for more accurate holes.

I used these drill bits to cut 3/8" holes in mild steel angle iron and tubing pieces. The steel material I had to cut through was real, 3/16" thick, not the 1/8" cheap stuff from the hardware store. I was really impressed how easily these bits cut through that steel. The holes are straight and smooth, really professional looking. There was no wobble to the bits in my drill press. The pilot part of the bit kept the bit travel straight. I've drilled 20 holes so far (about 4 inches of steel) and still on my first bit. That bit isn't showing any signs of slowing down. I'm very happy so far.

Wouldnt drill through galvanized steel. I bought one 7 dollar bosch just in case these sucked. Bosch went through 4 steel pipes and the anchors. This couldnt get through any of the metal at all. Paperweight.

slow cutting on steel perlins