Features: 1Includes: This socket extension kit includes the most commonly used sizes, 50, 75, 100, 150mm.These socket extensions are invaluable for those jobs that require additional extensions. 2Material: These socket extensions are made from high strength heat treated chrome vanadium steel coated with a nickel and chrome plated finish CRV for use in industrial, mechanical or construction work. 3Features: These socket extensions add the extra length you need to reach hard to reach fasteners, perfect for loosening or tightening fasteners in confined spaces. 4Enhanced Grip: The enhanced grip design turns loose fasteners by hand while the spring loaded stopper ball ensures that your socket isn't going anywhere. 5Essential Tool: Reliable, effective and efficient, this socket extension is an indispensable and practical tool for industrial and mechanical work. Specification: Item Type: Socket Extension Bar SetProduct Material: Chrome Vanadium SteelWeight: 153g / 5.40ozProduct Specifications: 50, 75, 100, 150mm Package List: 4 x Socket Extension Bar