Rustless steel rule, chrome anti-glass finish which provides a marked contrast to the permanent black figures and graduations. Dual marked Imperial and Metric. Two sides four edges Inches, 16ths, 32nds, 64ths, 20ths, 50ths, 100ths. mm, 1/2mm. Figured every 10mm in mm. Length. 1000mm / 39in Width 25mm Thickness 1mm