An architect-designed drafting accessory that attaches to the front edge of any drawing board. Slide the drawing down into Spiroll, the coiled lower part will be safely housed within an aluminum extrusion, while you work on the upper portion. Vinyl board cover can be installed over the spiral mounting bracket. Comes with a pair of standard Lexan clips for the attachment of parallel straightedge cables at any location. For use with all conventional instruments, including drafting machines and T-squares.