Best-Rite 824HM 12'W x 4'H Horizontal Sliding Board (4 Track/4 Panel) with Alumium Trim and TraySave wall space and add functional board surface with our innovative horizontal sliding boards. These customizable boards allow up to two and a half times more usable surface in the same area as a standard board, featuring panels that slide behind or in front of each other on a unique and smooth track system, making the boards ideal for multipurpose rooms or for keeping sensitive information hidden. Choose from two , three , or four track systems.