... treatment, Plating, Anti-slipping patchCategory we can process1. by componentsBolts, Screw bolts/Studs, Nuts, Tapping screws, Wooden screws, Washers/Gaskets, Check ... , Round, Truss, Button, PF, Pan washer, Cheese, Countersunk, Fillister, hexagon, Hexagon washer head, Hexagon socket button head and etc.3. by type of drive ...