1.Standard and non-standard 2.ISO9001:2008&RoHS 3.Materials:brass,steel,SS etc ... rings, Pins, Rivets and etc. 2. by head types Flat, Oval, Binding, Pan, Round, Truss, Button, PF, Pan washer, Cheese, Countersunk, Fillister ... , hexagon, Hexagon washer head, Hexagon socket button head and etc. 3. by type of ...