1.Standard and non-standard 2.ISO9001:2008&RoHS 3.Materials:brass,steel,SS etc ... /Slotting, Heat treatment, Plating, Anti-slipping patchCategory: 1. by components Bolts, Screw bolts/Studs, Nuts, Tapping screws, Wooden screws, Washers/Gaskets, Check ... , Button, PF, Pan washer, Cheese, Countersunk, Fillister, hexagon, Hexagon washer head, Hexagon socket button head and etc. 3. by type of drive ...