SHEET METAL GAUGE U S STANDARD GAUGE GAUGING PLATE RANGE 0 to 36 & DECIMALS (E 3) NOVELTOOLS SHEET METAL GAUGE U.S. STANDARD GAUGE GENERAL TOOL #21 GAGE GAUGE RANGE 0-36 SHEET METAL Sheet Metal Gage helps you to accurately determine the thickness of un-coated sheet metal, plate iron and steel. The Gauge measures U.S.Standard sheet metal sizes from 0 to 36. This heavy duty gage is made from hardened and tempered steel, and is stamped with sheet metal sizes on the front and their decimal equivalents on the back.