Rolling parallel rulers are multipurpose drawing instruments that let you measure in inches and centimeters and draw quadrants, squares, circles, angles, crosshatching, and vertical and horizontal parallel lines, quickly and easily. Functions as a compass, horizontal ruler, straightedge, protractor, circle template and angle template, all in one. Parallel gliders combine the functions of a T-square, triangle, transparent straightedge, and protractor in one.
Alvin parallel gliders are one of the most useful and convenient aids you will ever find for drafting, drawing, and nautical applications. Smooth gliding action to easily make parallel lines without twisting or turning under accidental pressure. Unique compass pivot button eliminates surface marking. Ideal for artists, students, pattern-makers, quilters, and designers. Includes instructions. Features durable clear acrylic plastic blade with printed graduations, throughholes at 1/2" increments for drawing circles. Ruling edge in inches (reading to 16ths) or in metric. Comfortable aluminum roller bar with non-skid rubber O-rings for smooth operation and firm grip on most any surface. Includes complete instructions.