High quality S2 steel bits with a zinc phosphate finish, each size in 30 and 75mm lengths. Hardened (58-62 HRC) and tempered for added strength. Includes 3/8"" and 1/2""Sq drive to 10mm hex Chrome Vanadium steel bit adaptors. Supplied in storage case with inclined tray for quick and easy bit selection. One of a comprehensive range of Premier Hand Tools, suitable for daily professional use. High quality S2 steel bits with a zinc phosphate finish, each size in 30 and 75mm lengths. Hardened (58-62 HRC) and tempered for added strength. Includes 3/8"" and 1/2""Sq drive to 10mm hex Chrome Vanadium steel bit adaptors. Contents: TRX-Star* Bits; T20, T25, T30, T40, T45, T50, T55, T60 (1 each 30 and 75mm), Security TRX-Star* Bits; T20H, T25H, T30H, T40H, T45H, T50H, T55H, T60H (1 each 30 and 75mm), Hex Bits; 4, 5, 6, 7, 8, 10, 12mm (1 each 30 and 75mm), Ribe Bits; M5, M6, M7, M8, M9, M10, M12, M14 (1 each 30 and 75mm), Spline Bits; M5, M6, M8, M10, M12 (1 each 30 and 75mm), Drive Adaptors;