1、Socket extension bar, perfect to go into narrow and deep space for screw disassembly. 2、Heavy duty chrome molybdenum steel construction, solid and durable. 3、Surface blackening treatment, not easy to rust or corrode. 4、Standard size, applicable to various scenarios. 5、Overall heat treatment for increased hardness, not easy to deform. Features: Socket extension bar, perfect to go into narrow and deep space for screw disassembly. Heavy duty chrome molybdenum steel construction, solid and durable. Surface blackening treatment, not easy to rust or corrode. Standard size, applicable to various scenarios. Overall heat treatment for increased hardness, not easy to deform.   Specification: Material: 42 chrome molybdenum steel Color: Black Optional Size: 1" 100mm, 3/4" 100mm, 1/2" 75mm, 1/2" 250mm   Package list: 1 x Socket Extension Bar