The draper 8 piece 12quot square drive tx star impact socket bit set is compatible with daggertorx fixing systems the sockets have an integral draper tx starreg bit forged from chrome molybdenum steel hardened and tempered with a black phosphate finish for corrosion protection there is also a groove and two holes for the retaining ring and pin the sockets come packed in a handy carryingstorage case safety note only impact sockets and accessories can be used with air or el