This 10-piece impact hex bit socket set from US PRO Tools includes sizes H4, H5, H6, H7, H8, H10, H12, H14, H17 & H19. It features a 1/2" drive, making it compatible with any 1/2" drive ratchets, bars, or extensions. The sockets are made from chromium-vanadium steel for enhanced strength, durability, and resistance to abrasion, oxidation, and corrosion. The bits are S2 type with a black phosphate finish for added protection and a European style CR-V socket design.