Socket forged from chrome molybdenum steel, hardened, tempered and chemically blacked for corrosion protection. A hole for accessory spring loaded ball. Packed in plastic storage case. Contents: 8, 10, 11, 13, 14, 16, 17, 19mm Chrome molybdenum steel, hardened, tempered and chemically blacked for corrosion protection Safety Note: ONLY impact sockets and accessories can be used with air or electric powered wrenches. NEVER use silver chrome vanadium steel sockets which can shatter and cause personal injury. 8x socket: 8, 10, 11, 13, 14, 16, 17, 19mm