ZFE 1Pc 5/8"-18 TPI HSS Left Hand Tap Machine Plug Tap Size:5/8"-18 TPI ,High-speed steel for compatibility with a variety of materials Extra fine 18 Thread Per Inch Hand threading tap with straight flutes cuts threads in through holes and blind holes Uncoated (bright) tools have no additional surface treatment or coating Round shank with square end allows tap to be used in hand or power-driven applications