Irwin Tools Tap and Drill Sets, 13-Pieces This tap and drill bit set produces a thread that is strong and easy to tap High-carbon steel plug taps are great for general-purpose threading 135 split-point drill bits give fast, precise drilling Set pieces: 6 - 32 NC, 8 - 32 NC, 10 - 24 NC, 10 - 32 NF, 12 - 24 NC and 1/4" - 20 NC plug taps and 7/64", 13/64", #29, #25, #21 and #16 drill bits, plus a T-handle tap wrench Includes a plastic storage case These drill and tap combinations produce a thread that is strong and easy to tap 135-Degree split point HSS drill bits ensure fast, precise drilling High carbon steel plug taps are ideal for general purpose threading Includes plastic storage case