This unique C.K designed channel socket set features a 3/8" drive, optimized for 21mm slotted channel using 17 and 19mm bolts. The flat-sided design allows for easy access. Manufactured from chrome molybdenum alloy steel for strength and durability, these sockets are impact rated for high torque applications. The set includes a Vorteck 100mm 3/8" square to E6.3 Hex adapter, and 17 and 19 mm sockets.