4-in-1 Double ended impact socket with 75mm 1/2"Sq drive impact extension bar. One socket can be used to replace four different sockets. Can safely be used with impact wrench, air ratchet, breaker bar or torque wrench. Constructed from Chrome Vanadium Steel for maximum strength, ideal for the professional. Features & Benefits:4-in-1 Double ended impact socket, 17 x 21, 19 x 22mm with 75mm 1/2"Sq drive impact extension bar.One socket can be used to replace four different sockets.Can safely be used with impact wrench, air ratchet, breaker bar or torque wrench.Constructed from Chrome Vanadium Steel (CRV) for maximum strength, ideal for the professional. Model No. SX1821 Specifications: Model No SX1821 Brand: Sealey Drive: 1/2"Sq Nett Weight: 0.42kg Sizes: 75mm Socket; 17 x 21, 19 x 22mm, 1/2"Sq Drive Extension; 75mm (3").