Fixed square drive inserts; Higher accessibility in width and height than ratchet inserts; full range coverage: from 9x12-1/4" to 27x36-1"; Easily exchangeable square drives from 1/4" to 1"; High performance alloy steel; Useful with 7435, 7465, TAWM9,14,24, TAW9,14,24 & IZO-D- torque wrenches