This Irwin tap and drill bit set is a must-have for any metalworking professional. The set includes a 1/4\" Npt tap and a 7/16\" drill bit, both made of high carbon steel for superior durability. Manufactured in the United States, this set is of industrial quality and is suitable for a variety of applications. The tap thread size is 1/4 in - 18 and the tap type is standard pipe tap. The brand is Irwin, a trusted name in metalworking supplies. This set is categorized under Business & Industrial, CNC, Metalworking & Manufacturing, Metalworking Supplies, Taps, and Pipe Taps.