If you don't have a countersink then you don't know what you are missing. Real precision but I somehow got hold of a countersink and oh my god they work so easily compared to a big drill bit that will never reach or drill deeper than you'd like - they cut slow but cleanly If you don't have something like that get this one - it's big enough to do everything - I don't think I've ever used a countersink 3/4" diameter but if so I have it now. This one looks very well made, drills clean. I use him steel, aluminum and plastic. Works great.