... One Way etc.MaterialCarbon steel, stainless steel, SS-304, SS-302, Aluminum, Brass, Bronze, medium carbon alloy steel etc.Surface TreatmentZn-plating ... , blue black zinc-plated,rust preventive oil, titanium alloy galvanized, silver plating, plastic, electroplating, anodizing etc.Applications ... our website: http://gdsx.en.alibaba.com all kinds of screw ,machine screw ,stainless steel screw and fasteners