... ,AL,Copper Finish:Zinc,Black,Hdg etc Size:M2-M72... spring Nut1.Standard:DIN,ISO,AS,NF,JIS,BS,ASTM,SFS ... :Carbon steel,A2,A3,A4,Copper,Aluminum etc3.Finish:Zinc plate,Black,HDG etc4.PackingWe hope to establish long-term cooperation ... to contact us. cyfasteners'at'hotmail'dot'com N-08 spring nut