The Ko-ken RS4012M/10-L60 1/2" Square Drive Bit Socket Set is a high-quality 10-piece collection designed for precision and efficiency in fastening tasks. This set includes hex bit sockets ranging from 4mm to 19mm, each with a length of 60mm, ensuring excellent reach and accessibility for a variety of applications. The sockets are securely mounted on a 300mm rail, making organization and quick retrieval easy. Crafted for durability and optimal performance, this bit socket set is an essential addition to any professional toolbox, providing reliable operation and versatility for all your fastening needs.