The Ko-ken RS4405A/10 1/2" Square Drive Socket Set includes ten 12-point sockets ranging from 3/8" to 15/16", mounted on a 300mm rail for easy organization and accessibility. The set features sockets in sizes 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", and 15/16". Engineered for versatility and durability, the 12-point design offers a secure fit and efficient torque transfer, making this set ideal for a wide range of fastening tasks. The robust rail ensures that the sockets remain organized and within reach, enhancing both convenience and productivity.