... :GB,DIN,ISO finish code: ZIPL, NIPL Material: brass,copper, bronze Economic price, good quality Products Information: 1Product:Bolt, Nut, Screw ... , Washer, Nails, Rivet, Insert, Brass fitting,Threaded rod, etc.2Matrrial: Copper, Bronze, Brass, Stainless steel, Aluminum, Grade.12.9 steel3Standard :GB ... you can trust our product quality.Other Products: high quality silicon bronze washer