Pipe Taper Tap, 0.5-in. X 14

1/2? x?14 NPT, Carbon Steel, National Pipe Taper Tap, Ideal For Pipe Fittings, Cuts Internal Threads In Piped, Norml Size Of The Tap Is That Of The Pipe Being Fitted, Tapered At A Rate Of 3/4" Per Foot, Use 45/64" Drill Bit.