... JIS, ANSI, DIN, GB, ASME, BSW, ISO 3.Different materials can be applied Material: Brass, Bronze, Carton ... by components Bolts, Screw bolts/Studs, Nuts, Tapping screws, Wooden screws, Washers/Gaskets, Check rings, Pins, Rivets and etc ... Hexagon washer head, Hexagon socket button head and etc. 3. by type of drive inserts Phillilps, Slotted, Pillips ... jielimetal.com.cn Fasteners Bolts Nuts Screws JL-SCR-001