1)Size:ID 29mm 2)Material: zinc alloy 3)Customers could choose the right color plating on the surface. O-ring:Size:ID 29mmMaterial: zinc alloyCustomers' own designs are appreciated.As the product adopted plating workprocedure, customers can choose the right color plating on it.The product can be used for shoe&bag accessory.Timely delivery can be accepted.If you are interested, please contact us. ...