... 5. Nice after-sale service Specification1.Thread type: machine thread, triangle thread, metric thread, tapping thread, ... disposing, hot-dip galvanizing, black oxide coating, painting, powdering, color zinc-plated, blue black zinc-plated,rust preventive oil ... featuresA company with industry and trade integrationMain ProductsWood Screw, Drywall Screw, Chipboard Screw, Machine Screw, Deck Screw, ...