With this ruler and your imagination, you can draw anything! No artist should be without this simply fantastic tool for drawing. It’s a ruler, compass, protractor and T-square all in one. It is small and lightweight so it can be with you at all times. It has a 12" ruler graduated in 1/16" increments and is made of clear impact plastic. It has a calibrated roller for horizontal lines, protractor for angles and arcs, magnifier for inspection and calibrated guide holes that let you draw vertical lines. It is a blast to make squares, quadrants, grids, arcs, angles and circles with up to a 24" diameter and triangles. An artist toy if there ever was one. Makes cross-hatching and virtually any other drawing technique so much more fun! It even makes perspective drawing easier then ever before.