Spiroliner Parallel Straightedges
A parallel straight-edge is installed to your drafting table and allows for a moving edge that always stays square with the table. This is great for drafting and laying triangles on, and also drawing horizontal lines. Elevated slightly above the surface of the drawing table, Spiroliner does not contact the surface of the drawing. It glides on wheels located at each end of the structural extruded aluminum blade. There are no rollers in the bottom of the blade to smudge or damage your drawing.