Manufactured from Chrome Vanadium steel with manganese phosphate finish for added resistance from corrosion. Turns any power drill into a power nut driver with added reach. Contains 1/4", 3/8" and 1/2"Sq drive adaptors. - Manufactured from Chrome Vanadium steel with manganese phosphate finish for added resistance from corrosion. - Turns any power drill into a power nut driver with added reach. - Contents: 65mm 1/4"Hex x 1/4"Sq Drive, 65mm 1/4"Hex x 3/8"Sq Drive, 75mm 1/4"Hex x 1/2"Sq Drive. - Lifetime guarantee*. - Model No. AK5521- One of a comprehensive range of Premier Hand Tools, suitable for daily professional use. - Manufactured from Chrome Vanadium steel with manganese phosphate finish for added resistance from corrosion. - Turns any power drill into a power nut driver with added reach. - Contains 1/4", 3/8" and 1/2"Sq drive adaptors. - Lifetime guarantee*.