Drive Size = 1/4 in, 3/8 in 타입 = Adapter Drive 타입 = Square 870/4 AdaptorTool shaft (adaptor) for power tool sockets with hexagon head drive by Wera. Drive: 1/4 inch hexagonal.Adaptor for machine-operated nut spinner sockets 1/4??external square 1/4??hexagon drive (Wera connecting series 4)870/4 Adaptor, 3/8??x 100 mm