The Track DT-PROM387-16 Diversitrack for Promethean Activboard 387 16 Foot Length can mount your interactive whiteboard in front of your existing chalk or dry erase board and you can slide it aside effortlessly when not in use. The Diversitrack employs a very secure and durable dual-track system with rails that attach above and below your existing chalk or dry erase board. It accommodates a standard height 48 inches tall existing board with chalk tray, up to 52.5 inches maximum. Professionally manufactured using a high-tech laser, the Diversitrack system is made up of a strong grade 5052 aluminum that has an epoxy powder coat finish in Oyster White.