Height from horizontal position 720 mm lowest 1130 mm highestA0 board size 1270mm x 920mm Monarch A0 and A1 Drawing Boards are manufactured from first quality steel tube- welded into a rigid construction and finished in white powder coat-the movement is controlled by two suitable positioned handles and counterbalanced by springs.This unit is available in A1 and A0 sizeswith counter weight parallel motion-lockable straight edge via a knob positioned on the top rail locking the drawing board parallel motion.22mm thick drawing board.