We are offering square drive adaptors are used as a converter to permit use of sockets and driving tools of different square drive sizes. It its available in ¼" (6.35mm), 38" (9.5mm), ½" (12.7mm), ¾" (19mm), 1"(25.4mm), 1.12"(38.1mm) square drives. The torque capacity of these adaptors is limited to the torque capacity of smaller square drive.