size:m8-m36 materail:carbon steel,stainless steel the produce can according to your requires 1)standard:DIN,ANSI,GB2)materail:carbon steel,stainless steel3)surface:black,phosphated,zinc plated and so on4)size:m8-m365)loading port:shanghai or ningbo china6)delivery days:30 days External teeth serrated lock washerers din6798