The Ko-ken RS2400W/9-BA is a 9-piece 1/4" Sq. Dr. Socket Set featuring 6-point Whitworth sockets, tailored for precision in working with BA (British Association) threads. This set includes socket sizes BA8, BA7, BA6, BA5, BA4, BA3, BA2, BA1, and BA0. Each socket is mounted on a 150mm rail, ensuring organized and accessible storage. The set is designed for durability and ease of use, making it an essential addition for tasks involving BA-threaded components.