... steelSurface TreatmentChrome plating, Silver plating, Zinc plating, Nickel plating, Tin-plating, Passivate, Oxidation, Phosphorization, Radiant PlatedStandardsJIS, ANSI, DIN ... socket button head and etc.3. by type of drive insertsPhillilps, Slotted, Pillips/slotted combination, ... Cross recess type, H drive, Hexagon socket, Square socket, Torx ...