Review on Spyder 600015 1.5 Inch Rapid Eject by Tommy Russo

Great! fast cutting! But do not use if nails are present. Unlike traditional hole saws, they destroy in just a few turns, completely remove the cutting heads in seconds if you hit a nail. Passed 2 in less than 10 minutes, both holes were unlucky and I hit a nail. I switched to a normal tooth and everything went away.