12'' Engineer Scale Ruler

Three sided architectural scale ruler, imperial size is 12". Laser etched aluminum architectural set square black for architects, students, draftsmen and engineers. Available in various ratios. Small proportions include 1 1/2", 1, 3/4", 3/8", 3/16", 3/32", 1/2", 1/4", 1/8", 3, 16. Large scales include: 1: 10, 1: 20, 1: 30, 1: 40, 1: 50, 1: 60. 12 4/5"L