Model Number: WS-4 Key Specifications/Special Features: Materials: stainless steel, copper, brass, carbon steel, aluminum (according to customer's requirements)Wheel spacersWheel adaptersSurface treatment: Zn-plating, Ni-plating, Cr-plating, tin-plating, copper-plating, the wreath oxygen resin spraying, the heat-disposing, hot-dip galvanizing, black oxide coating, painting, powdering, color zinc-plated, blue black zinc-plated, rust preventive oil, titanium alloy galvanized, silver plating, plastic, electroplating, anodizing ThicknessFrom To Inner diameter Outer diameter Thread 20mm 4x100 4x100 57.1mm 140mm 12x1.5/12x1.25/14x1.5 1" 4x100 4x100 57.1mm 140mm 1.25" 4x100 4x100 57.1mm 140mm 1.5" 4x100 4x100 57.1mm 140mm 2" 4x100 4x100 57.1mm 140mm