1/4 Inch Cobalt Drill Bits 5pcs Heavy-Duty Metal Drill Bit Set for Steel, Cast Iron (1/4" x 4")

Perfect replacements, sharp and well made.

Great tool

Nice sharp bit has held up good at this point at a good value.

I built a no weld go-kart out of steel. As you can imagine I had to build brackets for everything so that everything could be bolted together. For the bolt holes, the thickest steel I drilled through was cold rolled quarter inch steel. These bad boys pierce right through on medium drill settings. You definitely need a sturdy, variable speed, reliable drill and of course a good punch to start your holes. Unfortunately, I cannot say how accurate the starter tip is, as even with using a punch to plot and start the holes, the bit/hole "walked" a bit at the end of the day. Note that I was drilling this freehand without a drill press though.. I'm sure a drill press would have made things a lot better. Out of 5 bits in the pack, I drilled hundreds of holes and still have one bit left over. I would definitely recommend these.

nice drills will buy again

Okay for most projects, not very long lasting

works as said, very good purchase quality good, will see about durability.

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.