Used to tap some profile end holes in 8020.net branded T-slot aluminum extrusion, size 4080 (light). The pre-existing extrusion central pair of holes were already the perfect size for this dia tap.Didn't even bother with tapping oil, just swiped it with a touch of lithium grease I happened to have nearby, slotted it into the squirrely little two-screw-style T-grip 'handle' and went to town. 4 flutes helped the swarf loosen right out, only had to back up a half turn about every 3-4 turns to start, then about every other once getting pretty deep, so it didn't feel like it was binding up too much.Bolts threaded right in nicely afterward, so obviously it worked. Not giving it a rating for durability though because I obviously didn't challenge it, but appears to be in fine shape for more of the same when I need to next time.
Rating:
[5 of 5 Stars!]