*Dimension does not get lost when adding grids. *The tops of each of the squares are rounded smooth so glass glides easy. *Allows the configuration to go around a corner such as an L-Shaped counter or to design a backsplash. *Material is of impact resistant polycarbonate plastic. (Lexan) *See-Thru material allows the use of a template to be placed underneath such as an angle guide. *Also excellent light transmission for a lightbox. *Grids interconnect in such a way that you can flip one or more over in set-up, so you could have smooth areas amid pocketed areas. This would give you an area to score small pieces. **When emptying out the grids, you only have to pick up one section which you can conveniently empty into a small wastebasket without disturbing the rest of your gridded work area. **If you wish to store your grids, simply stack them and place in a drawer.