... Materials: 65Mn, SUS304H, 55CrSi ect. Finish: Rust-proof, Galvanized etc. Wire diameter:2-6mmMax OD:55mmMax height:100mmMaterials:65Mn,55CrSi ectFinish ... :rust-proof,xidation,galvanized etc.We are the one ... who can offer these:Various of springs and wire form, even punch ...