UNC UNF NPT NPTF NPSM ISO Tap Drill Sizes and Decimal Equivalents MAGNETIC Chart | eBay
Combination Taper Pipe Taps and Drills On Tapco Cutting Tools Inc.
Professional 5 Piece NPT Pipe Tap Set, Carbon Steel NPT Thread Forming Taps and Drill Bits Series Set Tool, Sizes Includes 1/8", 1/4", 3/8", 1/2", 3/4" in Storage Case - Amazon.com