All five extensions have a ¼” hex shank x 65mm long Nutsetter sizes -  ¼”,  ⁵⁄₁₆",  ⅜” Extension bar sizes - ¼” hex to ¼” square, ¼”hex to ⅜” square Floating magnet for constant connection with nut and maximum life Modified chrome vanadium for maximum torque Black nickel coating