Detailed Product Description Stainless Steel Washer: Detailed information Inside diameter: 1mm~100mmOutside diameter: 3mm~500mmThickness: 0.1mm~6mmMaterial: carbon steel, mild steel,aluminum, copper, stainless steelFinish: black oxide, zinc plated (white / blue /yellow), hot dip galvanized, nickel platedPacking: bulk or small packing according to buyer's requirement