Chief WMA2 Mounting Arm for Flat Panel Display, Projector For use with projectors and flat panels. Requires CMS extension column. dependent on wall structure. Color: Silver. Extension: 13. 0" - 21". Overall Dimensions (H x W x D): 11. 5" x 18. 5" x 13. 0" (292 x 470 x 330 mm). Weight Capacity: 25 lbs (11. 3 kg).