Schaedler Precision Ruler 18" Combo D - This rule contains 18 inches of all scales as described above (except Agates). And we’ve die cut interior slots to provide edge access to all four popular scales: Standard Inches, DTP Picas, Decimal Inches, and Metric Millimeters/Centimeters. The display includes Bullets, Bars and Ballot Boxes in a variety of sizes. And it can be very carefully cut into two separate 18" rules if you don’t mind risking the sight of blood. Coated with a subtle greenish tinge. The color of envy.