Vermont American 20372 1/4-Inch to 18 National Pipe Taper High Carbon Steel Pipe Taps
Irwin Tools 2623- 3 Piece High Carbon Steel - Tap 1/4" - 28 NF
Drill America DWTPT Series Qualtech Carbon Steel Pipe Tap, Uncoated (Bright) Finish, Round with Square End Shank, 3/4"-14 NPT (Pack of 1)
Irwin Tools 2524- 3 Piece Set - 8 - 32 NC, High Carbon Steel Machine Screw Tap