Draper 1 4 f x 1 4 m 75mm mag bit holder draper 82408 1 4 male x 1 4 female magnetic bit holder for use in power drills and driver handles shaft male hexagon from chrome vanadium steel hardened and tempered with the bit holder female hexagon cold forged from stainless steel display packed draper 82408 1 4 f x 1 4 m 150mm mag bit holder