Forms new threads, re-forms burred threads and cleans out obstructionsReversible, high-carbon tap with three clearly marked thread sizes on each endHandle is interchangeable with 7-in-1 Screwdriver (35-908) and Conduit Deburrer (35-083)6-32,8-32 & 10-32 on one tapping side, 10-24,12-24 & 1/4-20 on the other