I needed to drill out 3/4 x 1/2” pipe bushings to let 1/2” pipe nipples rotate freely in them. Had a 3/4” coupler in vice grips as the fixture & needed to do 20 of them. Ideal size would have been 55/64 to just pass a 1/2” nipple. Ordered from Irwin and American. The Irwin struggled through one bushing. The American couldn’t even do that. Chuck’ed up the 7/8” Bad Dog from their set. It was 1/64 over the diameter I wanted but not too bad. The Bad Dog ate through 20 in my self-feed press in no time at all. I was squirting oil but don’t know that I even needed to. 20th bushing drilled out as easy and smooth as the first one!… Quite the perfirmance by a Bad Dog bit!! Wish they’d fill in the gaps by 64th in their set but result was good enough for a home-brew CD shelf I’m fabricating out of Sch 40 iron pipe.