... ,brass,copper Finish:Plain,black,zinc plated,nickle,etc Description:Internal teeth serrated lock washers Features:1)Standard:DIN,ISO,ANSI/ASTM ... and samples4)Finish:Plain,zinc plated,black,chromate,dacoramt,HDG,etc.5)Packing:Export Packing (Carton/ Pallet).also according to customer ...