Reach all fasteners, even in tough spots with our ball spring design impact universal joint set, thanks to the smooth and fuss-free 360-degree rotation feature. universal joint sockets are made from robust heat treated Chrome Molybdenum alloy steel. Bead/perforation design, The bead is easy to change the sleeve. The perforation is more suitable for working at heights. Carbon black, phosphating, anti-rust. Choice: style 1：Length 4cm at the interface 0.63cm style 2:Length 5cm at the interface 1cm style 3:Length 7cm at the interface 1.25cm. Package Includes: 1x Universal Joint Socket(4 Pack) Note: Transition: 1cm=10mm=0.39inch Please allow slightly 0-1cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience!