The Draper 8 Piece 1/2" Square Drive Tx-Star Impact Socket Bit Set is compatible with † Torx fixing systems. The sockets have an integral Draper TX-STAR bit, forged from chrome molybdenum steel, hardened & tempered with a black phosphate finish for corrosion protection. There is also a groove & two holes for the retaining ring & pin. The sockets come packed in a handy carrying/storage case. Safety Note: ONLY impact sockets & accessories can be used with air or electric powered wrenches. NEVER use silver chrome vanadium steel sockets which can shatter & cause personal injury.