XIANQI The set has 3 available sizes including, 1/4 inch 3/8 inch 1/2 inch (6.3mm/9.5mm/12.5mm) Also works around confined areas or obstructions, will easily access hard-to-reach fasteners. Our socket joints will easily convert to four directions freely, 90-degree swivel head locks onto socket and drive tang for fast and easy use, to make leverages can turn to any direction. Each bit is equipped with a spring loaded ball on both ends of the bit to lock onto sockets and impact tools securely, preventing them from falling down. The job will be done as fast as possible using the right joint set to get at your nuts and bolts. This universal joint set is suitable for all the hexagonal side handle four square hole groove, which is applied to repair, car modification, wrench socket transformation. It is applied to vehicle transmission. MaterialChrome Vanadium Steel Number Of Pieces3 Gunpla 3 Piece Impact Universal Joint Set Chrome Silver Finish Specifications: Color: Chrome silver Material: Chrome vanadium steel CR-V The diameter: 1/4" (6.3mm); 3/8" (9.5mm); 1/2" (12.5mm) Full length for each: 42mm; 56mm; 75mm Features: Universal joint socket set made from high quality chrome vanadium steel. Spring loaded ball bearing on head holds sockets/extensions securely. Locks onto ratchet or extension bar. Allows easy access in awkward areas. Universal socket flexible joint set includes 1/4", 1/2", and 3/8" inch flexible sockets. 3pc universal joint set ratchet angle extension bar 1/4" 3/8" 1/2" socket adapter. ColorSilver Package includes: 3 pc universal joint set drive ratchet sockets