Robust board of unbreakable, non-warping material. Ergonomic design for easy, comfortable working. Parallel straightedge with STOP-and-GO locking/ unlocking action. The L-system straightedge design - allows drawing along the top edge of the straightedge right down to the bottom of the sheet, with full accuracy and stability Two strip clamps and a corner paper clip facility ensures drawing sheet remains secure Set square can attach to the lockable straight edge L-shaped straight edge for improved stability and full use of drawing area Board is scratchproof and washable Comes complete with draughting square and board tilters