The set of keys is made of very durable chrome vanadium steel, which guarantees extremely high quality. They are perfect for car service and workshops as well as home garages. The set includes: 1/2" Sockets: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 24, 27, 30, 32mm 1/2" hole Sockets have excellent mechanical strength, high wear resistance and high durability. Hexagon sockets. The nut is made of CrV steel. Dual-composite rubber grip to prevent hand slippage.