Internal teeth serrated lock washers Material:steel,stainless steel,brass,copper Finish: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 and samples4)Finish:Plain,zinc plated,black, ...