The Ko-ken RS4400MZ/10 1/2" Square Drive Socket Set is a comprehensive Z-series collection that includes ten high-performance 6-point sockets, sized 10mm, 12mm, 13mm, 14mm, 17mm, 19mm, 21mm, 22mm, 24mm, and 27mm, all securely mounted on a sturdy 300mm rail for easy organization and access. This socket set is engineered to provide superior torque transmission and durability, making it ideal for a wide range of applications. With its exceptional design, the Ko-ken RS4400MZ/10 Socket Set ensures a perfect fit and a reliable grip, making it an essential addition to any tool collection for professionals and enthusiasts alike.