Regal Cutting Tools 008767AS Interrupted Thread Pipe Taps; Thread Size (Inch): 1/4-18 in; Thread Standard: NPTF; Material: High Speed Steel; Number of Flutes: 5.0; Projection: 0.4590 in; Finish: Bright; Overall Length (Inch): 2.4375 in; 2-7/16; Threa