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Drill America 12-Piece Tap and Die Set in the Tap & Die Sets department at Lowes.com
QWORK NPT Die Set, 6Pcs PVC Thread Maker Tool,Pipe Round Die Set, Pipe Threader Plumbing Tool, Three Maker Size: 1/2", 3/4", 1" - - Amazon.com
Ridgid® 12-R 12-R Exposed Manual Ratchet Threader Set - 1/2 in. to 2 in. NPT - Olsen Chain & Cable
Drill America - DWTHXNPT-Set 6 Piece NPT Pipe Die Set, 1/8", 1/4", 3/8", 1/2", 3/4" and 1", Rethreading, Carbon Steel, Wooden Case: Amazon.com: Industrial & Scientific
12 PIECE 1/8-1" NPT TAPER PIPE TAP & HEX DIE SET (1011-3312)
Buyr.com | Tap & Die Sets | RIDGID 36890 Model OO-R Die Head, 12R Alloy Die Head comes with 1/2-inch High-Speed, Factory Set Dies that Deliver Clean, Precise 14 TPI