Promotion steel key ring 1.Material: steel, stainless steel 2.Outter diemeter:2~5CM ... : 1) Wire Diameter: 1.0~ 3.0mm 2) Type: Key ring. 3) Main material: carbon spring steel, steel, stainless steel, alloy5 ... plating etc. or customized coating is available.6) Good hardness, Long service-life, durable.7) Price: EXW price is competitive, no ...