This 12-piece shallow impact socket set from US PRO Tools features metric sizes ranging from 8mm to 19mm. The sockets are 3/8" drive and have a 6-point single hex design. They have an overall length of 28mm, are hardened, and finished with a phosphate coating for protection. The set is supplied on a metal storage rail, making it convenient for organization and transport. The sockets are compatible with any 3/8" drive ratchets, bars, or extensions.