Would you like help with scale and proportion? Then this clever instrument is for you. These scale dividers will help you transfer measurements from life, photographs and sketches with ease achieving accurate proportions every time. Featuring eleven graduation holes so you can achieve your preferred scale, they also have the ability to reduce or enlarge angles, in ratios from 4:1 to 1:4, to aid correct perspective and the capacity to find mid points quickly and easily. Dimensions: 32.5 x 1.7 x 1.7cm