HAND TAP SET, HSS, GT, 5/16 BSW, 3PC; Kit Contents:3 Pieces 5/16 Taps; SVHC:No SVHC (16-Dec-2013); AF Size - Metric:6.30mm; External Diameter:7.938mm; Kit Contents Descriptive:Set of three 5/16 taps; Overall Length:72mm; Shank Dia:8mm; TPI (f):18; Thread Length:16mm; Thread Size:5/16; Thread Type:BSW