... -3''length:5mm-250mm,1/4''--10''matrrial: brass,copper,bronze, silicon bronze, aluminium bronze, nickel bronze, phosphor bronze, manganese bronze,etc.finish: nickel, tin, chrome, zinc, silver, gold ... , and washers etc, which involve in many kinds of matrials, brass, copper, bronze and related surface treatments. TEL:+86-411-39829018 FAX:+86 ...