... screws, Wooden screws, Washers/Gaskets, Check rings, Pins, Rivets and etc. 2. by head types Flat, Oval, Binding, Pan, Round ... Fillister, hexagon, Hexagon washer head, Hexagon socket button head and etc. 3. by type of drive inserts Phillilps, Slotted, Pillips/ ... Square socket, Torx, Triangle drive, Indented hexagon and etc.Certificates: ISO 9001:2008 and RoHs compliance,Standards: JIS, ANSI, DIN, GB, ...