... , color zinc-plated, blue black zinc-plated,rust preventive oil, titanium alloy galvanized, silver plating, plastic, electroplating, anodizing ... Test, Durometer, and Coating Thickness Tester.WorkforceA group of experienced production technician, sophisticated engineer and dedicated QC.About ... our website: http://gdsx.en.alibaba.com all kinds of screw ,machine screw ,stainless steel screw and fasteners