This 5319S pipe tap is made of high speed steel and has a 0.438 inch diameter, 1⅜ inch long shank. It is designed for use with steel, and meets the standards for USCTI Table 311, USCTI. This 5319 series pipe tap has an oxide finish, and has fractional inch measurements. It is non-coolant through, has right hand direction with a 2⅛ inch length. Plus it has five flutes.