12" Deluxe Scale Model Reference Rule Designed for the scale and architectural modeler that requires the use of 1/72, 1/48, 1/35, 1/25, and 1/24 scales. Constructed of non-glare blue tempered anodized aluminum with silver calibrations that will not fade or chip when cleaned with solvents. This tool is perfect for those scratch building applications and dioramas. Length: 12-1/2" (317mm) Width: 1-1/8" (28mm) Thickness: 0.079" (2mm)