Review on Irwin Tools 1882793 SPEEDBOR Countersink: Get Faster and Smoother Drilling Results by Mark Clark

Drills broke after minimal use and a bit broke off the hex shank. A screw hole with a broken bat on the bottom is no fun. The stop collar is still useful. I switched to another brand of yellow drill bits. I haven't broken them in a year and the Irwin collar works. If I have $$, I get a set of snappy tools.