spring nut Material:A2,A3,A4,AL,Copper Finish:Zinc,Black,Hdg etc Size:M2-M72... spring Nut1.Standard:DIN,ISO,AS,NF,JIS ... ,ASTM,SFS,GB,NON-STANDARD etc2.Material:Carbon steel,A2,A3,A4,Copper,Aluminum etc3.Finish:Zinc plate,Black,HDG etc4.PackingWe ...