The Ko-ken RS3405W/7 3/8" Square Drive Socket Set is a 7-piece flat drive Whitworth socket collection designed for precision fastening. This set includes 12-point sockets in sizes 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", and 1/2", all securely mounted on a 200mm rail for easy organization and accessibility. The flat drive design enhances torque transfer while reducing wear on fasteners, making this set ideal for a variety of professional applications. Engineered for durability and performance, this Whitworth socket set is an essential addition to any toolbox, ensuring efficient and reliable operation in fastening tasks.