#7 螺旋易出圓形螺絲取出器 Drill Hog®

Snapped a rusty 1" pipe nipple flush with the wall and this walked it right out. The spiral bit grabbed on the first try with a 17/32" pilot hole. Way less swearing than my old extractor set.

Grabbed this after stripping the head off an old drain plug, and it bit into the 7/8" stub on the first try. The spiral flutes hold tight instead of slipping, though you really do need the 17/32" pilot hole for it to seat right.

I had a rusted 1/2" pipe fitting that nothing would budge until I drilled it out with a 17/32" bit and tapped this #7 easy out in. The spiral bit grabbed almost immediately and backed the whole thing out without stripping. For the price, this is staying in my toolbox.