... :Plain,black,zinc plated,nickle,etc Description:Internal teeth serrated lock washers Features:1)Standard:DIN,ISO,ANSI/ASTM,BS,JIS ... ,non standard2)Material:Steel,stainless steel,brass,copper3)All types and sizes are available,also produce according to customers'drawings ... / Pallet).also according to customer`s requirements Internal teeth serrated lock washers