Irwin tools 1906P Hanson® High Carbon Steel Taper Pipe Tap, 3/4"-14 NPTIdeal for pipe fittings. Cuts internal threads in pipes. Nominal size of the tap is that of the pipe being fitted. Tapered at a rate of 3 4" per foot. Use 7 16" drill bit. Material: High Carbon Steel Cuts internal threads in pipes Nominal size of the tap is that of the pipe fitting being tapped Ideal for pipe fittings Tapered at a rate of 3 4" per foot Use 7 16" drill bit. Specifications: Size: 3 4" 14 NPT (National Pipe Taper) Tap Point Style: Plug