1、Made of 42 chrome molybdenum material with explosion-proof features 2、Thicker and more impact resistant, the whole is subjected to secondary quenching 3、Strong torsion, more durable and no burr 4、The surface is blackening and not easy to rust 5、The socket has anti-bolting hole and inner concave groove design which is more convenient to use 6、High quality materials and fine craftsmanship greatly increase the service life 1 x Impact Bit Socket Item Type: Impact Bit SocketMaterial: 42 Chrome MolybdenumFeatures: Explosion-ProofSystem: MetricSurface Treatment: Blackening Wrench Shape: Single Head WrenchOptional Style: 3/4in Impact Bit Socket H12, 3/4in Impact Bit Socket H14, 3/4in Impact Bit Socket H17, 3/4in Impact Bit Socket H19