... Oxidation, Phosphorization, Radiant Plated,Process: Heading, Threading, Angle-cutting/Slotting, Heat treatment, Plating, Anti-slipping patchCategory: 1. by ... /Gaskets, Check rings, Pins, Rivets and etc. 2. by head types Flat, Oval, Binding, Pan, Round, Truss, Button, ... Cheese, Countersunk, Fillister, hexagon, Hexagon washer head, Hexagon socket button head and etc. 3. by type of drive inserts ...