The Trueline Portable A1 Drawing Board is fitted with a cross-wire parallel motion system, controlled by nylon covered, stranded steel cable, running on corner pulleys. Moulded corner blocks attach the pulleys to the board and also protect the corners of the board from damage. The Trueline is supplied with a double bevelled transparent straightedge. A simple cam break on both ends clamp on plastic edging strips allowing the straightedge to be locked in any position. Two thumb screws secure it so that it can be tilted or raised to allow artwork, cutting mats etc. to be positioned under it. The board can be used flat or at a 15º working angle.