... PB1.0*6Material: Brass, Bronze, Carton steel(low/medium/high carbon steel) Stainless steel, Aluminum alloy,Surface Treatment: Chrome ... treatment, Plating, Anti-slipping patchCategory: 1. by components Bolts, Screw bolts/Studs, Nuts, Tapping screws, Wooden screws, Washers/Gaskets, ... head, Hexagon socket button head and etc. 3. by type of drive inserts Phillilps, Slotted, Pillips/slotted combination, ...