Manufactured from chrome vanadium steel. Hex / Allen / Torx and spline bits suitable for all purposes. Hardened tipped for strength and durability. 3/8" and 1/2" Socket Adapters so will fit any 3/8" or 1/2" ratchet/bar. Set includes: 1 x Bit Holder 1/2" Dr x 10mm, 1 x Bit Holder 3/8" Dr x 10mm, 7PC 30mm Hex Bit: 4, 5, 6, 7, 8, 10, 12mm, 7PC 75mm Hex Bit: 4, 5, 6, 7, 8, 10, 12mm, 5PC 30mm Spline Bit: M5, M6, M8, M10, M12, 5PC 75mm Spline Bit: M5, M6, M8, M10, M12, 7PC 30mm Torx Bit: T20, T25, T30, T40, T45, T50, T55, 7PC 75mm Torx Bit: T20, T25, T30, T40, T45, T50, T55. Supplied in a blow moulded storage case.