Professional tool for commercial or occasional use 1/2" drive extension bar set so will fit any 1/2" drive ratchets / sockets etc... 1/2" square drive, with sprung ball socket retainer. Manufactured from chrome vanadium steel for strength and durability. SET Includes; 1 x 1/2" drive extension total length 50mm 1 x 1/2" drive extension total length 75mm 1 x 1/2" drive extension total length 125mm 1 x 1/2" drive extension total length 250mm 1 x 1/2" drive extension total length 375mm