Designed to eliminate the confusion & strain of reading your typical ruler. On the SAE side, the 1/4", 1/8" & 1/16" increments appear in a vivid white on a high-contrast, vibrantly colored background; & on the metric side, the millimeter increments appear in a vivid white on a high-contrast black background, making this ruler easier to use than others in the market. The ruler's non-glare surface also helps you take a quick & easy measurement. Ruler works great as a straight edge, too. Ruler Type: Standard / Metric; Length: 18.25"; Standard Scale: 1/32"; Metric Scale: Millimeters.