10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 21mm, 22mm, 24mm, 27mm. 50mm extension bar. Chrome vanadium steel, correctly hardened and tempered. Black phosphate finish. NOTE impact sockets and accessories can only be used with air or electric powered wrenches. Never use silver chrome vanadium steel sockets which can shatter and cause personal injury.