[greencactus3]

i actually have no idea what brand they are. but they are harder than regular steel. our carbide and cobalt bits were brand new. so they hsould've been nice and sharp. and we are using a drill press. i dont remember what rpm but we tried a variety of speeds. and we were using motor oil. and we were basically drenching the bit/sprocket continuously while drilling. and we are supposed to go slower rpms? thats what i thought but the guy someone talked to from the hardware store said spin it as fast as you can. darn. knew that meant more friction...