Sammons Preston Activity Boards enables users to stack working materials up to 1" thick on generous plywood boards measuring 18" x 27". The adjustable wood legs stabilize the board on the edge of a work surface to prevent slipping. A telescoping leg with eight adjustable angles from 15 to 75 degrees, make materials easily accessible. Wood and metal clamps and horizontal slots secure materials; deluxe models include vertical slots to secure round or curved objects.