... :Bolt, Nut, Screw, Washer, Nails, Rivet, Insert, Brass fitting,Threaded rod, etc.2Matrrial: Copper, Bronze, Brass, Stainless steel, Aluminum, Grade.12 ... ''5Length:5mm-250mm, 1/4''--10''6Finish: Nickel, tin, chrome, zinc, silver, gold plated or as required7Certifications:ISO9001:2000, Rohs8Delivery time ... you can trust our product quality.Other Products: environmental brass double spring washer