Quartet Prestige 2 Connects Full Feet Board Grid Assistant, 8 x 4 Feet Board Compatible (85386) Full Board Grid Assistant allows for simple, straight segmentation of the board to create a calendar or schedule of any size on your 8' x 4' Prestige 2 whiteboard Included wet-erase marker draws the grid; damp cloth is needed to erase grid lines Slide the grid assistant across the board to create horizontal lines. Slide the marker up and down the grid assistant to create vertical lines. Fill in grid data with dry-erase marker to allow erasing with a whiteboard eraser and still keep grid lines intact Attaches to the top and bottom of a Quartet Prestige 2 whiteboard to serve as an integrated writing tool. Combine with other Prestige Connects Accessories for a fully-functional, convenient and collaborative workspace.