Description: Material: Stainless Steel 203 Color:Silver Gaging non-ferrous wire and metal such as copper, brass, etc Gaging uncoated sheet, plate iron and steel 0-36 standard Specification: Inch Scale: 0.3125-0.007inch Outer Diameter: Approx. 8.4cm/ 3.31inch Inner Diameter: Approx. 2.5cm /0.98inch Package Includes: 1 xStainless Steel Wire Gauge