... Nuts, Tapping screws, Wooden screws, Washers/Gaskets, Check rings, Pins, Rivets and etc.2. by head typesFlat, Oval, Binding, ... Cheese, Countersunk, Fillister, hexagon, Hexagon washer head, Hexagon socket button head and etc.3. by type of drive insertsPhillilps ... /slotted combination, Cross recess type, H drive, Hexagon socket, Square socket, Torx, Triangle drive, Indented hexagon and etc.Certificates: ...