Professional hex bits for commercial or occasional use Allen Hex key sockets Male allen key sockets Metric sizes M6 / 6mm impact hex bit sockets 6mm hex / Allen key bits Impacted Allen key sockets Impacted hex bit for added strength and durability Manufactured from chrome vanadium steel for strength and durability Short and long hex bits so perfect for access in restricted hard to reach areas Total length of the allen key sockets 53mm and 78mm 1/2" drive so will fit any 1/2” drive ratchets / extensions / power bars etc...