Martin U-PEB2436K Adjustable Angle Parallel Drawing Board, XX Large The only parallel straightedge board utilizing an anti-warp aluminum body straightedge for strength and stability Equipped with a six-position adjustable stand. Angle adjustment varies with size of board. Larger boards will have a larger angle adjustment. Locking device to lock in any angle that you would like to draw Each side of the unit has large knobs for adjusting the straight-edge to align with the artwork/drawing and stay parallel High resin particle board to prevent board breakage