Lightweight plastic construction, ideal for students or professionals. Transparent grey straightedge locks in any position for either vertical or horizontal ruling. Corner paper clamps secure media sizes up to 11" x17", and reversable feet allow elevation of board at 7 degree or 15 degree incline. Vinyl carrying case with handle included. Optional Protractor Drafting Head #25445 attaches easily to straightedge for increased versatility. Automatically sets and locks in 15 degree increments, locks at any angle.