Premium Material: Scale Ruler is made of quality plastic, rounded corners, with excellent workmanship, can prevent damaging technical drawings during use 6 metric scales: Scale rule includes 6 scales: 1:20, 1:25, 1:50, 1:75, 1:100, 1:125, easy to use and understand,can be easily measured from right to left or left to right Clear Scales:Scale ruler architect is extremely accurate,clear to read, fine sharp profile, nice weight to it,Ideal for architects, engineers and professional use Design:Architectural scale ruler is designed with 3 different colored grooves, Three different coloured sides it makes for quick selection of the measurements and scale you need Widely Application: Triangular scale ruler lightweight,and be supplied in a reuseable rigid plastic case,easy to carry and store,ideal for ideal for cutting, professional drawing, measuring,decoration design, classroom and office use, Weight: 0.10582188576 Pounds, Manufacturer: Aruicheng