Union Butterfield 1500(UNS) High-Speed Steel Hand Tap, Uncoated (Bright) Finish, Round Shank With Square End, Taper Chamfer, 1"-14 Thread Size Hand threading tap with straight flutes cuts threads in through holes and blind holes Available in UNC (Unified Coarse), UNF (Unified Fine), or UNS (Unified Special) right-hand thread options for different applications High-speed steel is compatible with a variety of materials Uncoated (bright) tools have no additional surface treatment or coating, suitable for general-purpose applications Round shank with square end allows tap to be used in hand or power-driven applications