Look no further folks. I've had this bit for 2 years when I installed the cable. I've never seen anything cut through pretty much anything like butter. I've driven 3 nails in my life and wanted to torture the bit so I just kept using it. Irvine, not Nails, won. I read reviews here about people hitting nails and breaking them. I'd be interested to know what kind of nails they hit. Personally, I literally get holes drilled in everyone. Single. Day. You can't beat Irwin.