Back-to-Back Monitor Mount (XL) Heavy-Duty Monitor Mount Modular Accessory Approach for Monitor Mounting For Use with CM-XL Series of Telescoping Poles SKU: MMB0601 Category: Monitor Mounts Tags: 400x400, Back-to-Back, Monitor, Steel Documentation Model Number Documentation Product Information Sheet Model NumberMMB0601 —Back-to-Back Ceiling Monitor Mount, 1.5″ NPT, VESA 400×400, Black (used with a CM-XL-x pole)