1. Material: 20MnSi, 20Mn2, 25MnV (Alloy Steel) 2. Size: 7-28mm 3. Surface Treatment: Black Painted, Hot Dip Galvanized 4. Accurate Quotation Need: (1) Size: Material Diameter,short, medium, or long link chain (2) Grade (3) Surface Treatment Package: Drum On Pallet,Wooden Case Delivery:By Air,By sea,By Express