The Ko-ken RS4400A/10 1/2" Square Drive Socket Set is a 10-piece collection designed for durability and efficiency in various fastening tasks. This set includes six-point sockets in sizes 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", and 15/16", all securely mounted on a 300mm rail for easy organization and quick access. Engineered to provide a reliable grip and minimize rounding of fasteners, this socket set is an essential tool for both professionals and DIY enthusiasts. Its robust construction ensures long-lasting performance, making it a valuable addition to any toolbox.