... applied Material: Brass, Bronze, Carton steel(low/medium/high carbon steel) Stainless steel, Aluminum alloy,Surface Treatment ... -slipping patchCategory: 1. by components Bolts, Screw bolts/Studs, Nuts, Tapping screws, Wooden screws, Washers/Gaskets, Check rings, Pins, Rivets ... , PF, Pan washer, Cheese, Countersunk, Fillister, hexagon, Hexagon washer head, Hexagon socket button head and etc. 3. by type ...