The Wire Gage helps you to accurately determine the thickness of American Standard wire from 0 to 36. The Gage works with all non-ferrous wires, metals and rods such as copper, brass and aluminum. This heavy duty tool is made from hardened and tempered steel, with a satin finish for easy reading of sizes. Decimals on the back and gauge sizes are in the front.3-1/4" diameter; 3/32" thick.