The Martin pro-draft parallel straightedge kit is the premier item in its class. The only Parallel Straightedge Board utilizing an Anti-warp Aluminum body straightedge for strength, and stability. Note that each side of the unit has large knobs for adjusting the straight-edge to align with the artwork/drawing and stay parallel. Equipped with a 6-position Adjustable stand; Board size; 20-inch by 26-inch.