لقمة ثقب حلزونية كهربائية UNIBIT كوبالت M42 Drill Hog USA

The cobalt M42 flutes cut through 16-gauge steel like it was butter, and the spiral design pulls chips out instead of clogging up. I drilled about 40 holes in a junction box project and it still bites hard.

Bought the 3/16" to 1/2" six-step bit mainly for enlarging holes in electrical panels, and the cobalt M42 stays sharp way longer than the cheap titanium ones I used to burn through. The spiral flutes clear chips nicely too, so I'm not stopping every few seconds to brush them out.

The cobalt M42 bits cut through my electrical panel like butter, way faster than the cheap titanium set I had before. The spiral flute clears chips nicely so I'm not constantly backing out to unclog them. Six steps from 3/16" to 1/2" covers most of what I need for conduit fittings.