General description Sealey Premier TRX-Star/Security TRX-Star/Hex/Ribe/Spline Bit Set is a comprehensive 74-piece set designed for professional use. Made from Chrome Vanadium 6150 steel, these bits are hardened to 52-53 HRC and tempered for enhanced strength and durability. The set includes both 3/8" and 1/2" square drive adaptors, making it versatile for various applications. Technical specifications Material: Chrome Vanadium 6150 steel Hardness: 52-53 HRC Bit lengths: 30mm and 75mm Contents: TRX-Star Bits (T20, T25, T30, T40, T45, T50, T55, T60), Security TRX-Star Bits (T20H, T25H, T30H, T40H, T45H, T50H, T55H, T60H), Hex Bits (4, 5, 6, 7, 8, 10, 12mm), Ribe Bits (M5, M6, M7, M8, M9, M10, M12, M14), Spline Bits (M5, M6, M8, M10, M12), Drive Adaptors (3/8"Sq x 10mm Hex, 1/2"Sq x 10mm Hex) Compatibility and accessories Compatible with 3/8" and 1/2" square drive tools Includes 10mm hex adaptors Installation Easy bit selection with inclined trays in the storage case Usage Suitable for