The Waffle Grid is made of high impact Lexan, the surface of the 1/2-inch pockets is rounded smooth to allow glass to slide. Want to clean out debris from a section? Just lift it out...no need to disturb your whole work surface. An interconnecting grid allows the user to configure the shape of their work table. Randomly turn up individual grids to have a smooth area amid a pocketed area. Waffle grid comes packaged in a 4-Pack of 11-1/4" x 11-1/4" grid sections. Modular design allows you to have one small surface of 11" x 11" square or a large surface of unlimited size by interconnecting many grids. All 4 squares make up an area of 22.5" x 22.5" This surface accommodates Cutter's Mate and Morton Tools.