Klein Tools Drill/Tap Bit Set (8-piece, model 32217)

One pass drills the pilot hole and cuts matching threads (6-32, 10-24, 1/4-20) — most consistent performer across aluminum drilling speed, tapping torque, thread durability, and mild steel durability, 17 brands tested.

Klein's higher price is justified by across-the-board consistency rather than winning any single category outright, per this independent test — purpose-built for electricians doing repetitive box/bracket mounting work.