The Ko-ken RS3400W/7 3/8" Square Drive Socket Set is a 7-piece Whitworth socket collection designed for precision fastening. This set features 6-point sockets in sizes 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", and 1/2", all mounted on a 200mm rail for easy organization and accessibility. Engineered for durability and performance, these sockets provide a secure grip on fasteners, making them ideal for a variety of professional applications. This Whitworth socket set is a valuable addition to any toolbox, ensuring reliable and efficient operation in your fastening tasks.