The Ko-ken RS3405M/12 3/8" Square Drive Socket Set is a 12-piece flat drive socket collection designed for efficiency and precision. This set features 12-point sockets in sizes 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, and 19mm, all securely mounted on a 300mm rail for convenient organization and access. The flat drive design enhances torque transfer while minimizing fastener wear, making this set ideal for a variety of professional applications. Engineered for durability and performance, this socket set is a valuable addition to any toolbox, ensuring reliable operation in your fastening tasks.