... steel key ring 1.Material: steel, stainless steel 2.Outter diemeter:2~5CM 3.Wire die:1.0~3.0mm Promotion Steel key ... 0~ 3.0mm 2) Type: Key ring. 3) Main material: carbon spring steel, steel, stainless steel, alloy5) Surface treatment: Zinc plating, powdering ... provide with compression spring, torsion spring, extension/tension spring, steel spring, hook spring, furniture spring, industrial spring, car ...