The sockets are constructed of high quality chrome vanadium steel with a mirror chrome finish. They are made durable and produced to serve for a long time.The set has 5 available sizes including, 1/4 inch 3/8 inch 1/2 inch (6.3mm/10mm/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.