This laser-etched aluminum triangular scale ruler is designed for architects, students, draftsmen, and engineers. Measuring approximately 12 inches on each side, it features clear, easy-to-read imperial markings and two sets of scale options for versatile drafting and technical drawing applications. Smaller scale options include 1 1/2", 1.5", 3/4", 3/8", 3/16", 3/32", 1/2", 1/4", 1/8", 3", and 16". Larger scale options include 1:10, 1:20, 1:30, 1:40, 1:50, and 1:60. Length: 12 inches.