1/2" drive coupler adaptor for 10mm hex screwdriver bits Manufactured from chrome vanadium steel for strength and durability 1/2" drive so will fit any 1/2" drive ratchets, power bars Suitable for all bits with a 10mm hex Total length 40mm Comes with a little ball holder as well so hen the screwdriver bits are in place they wont fall out when using (keeping them safe and secure) Spring clip and ball bearing for secure retention