Chief Manufacturing is the leader in Presentation Support Systems. Chief designs, manufactures, markets, and distributes internationally a broad product line for the audio/visual/video presentation market. Products include LCD Projector ceiling mounts, wall mounts, electric lifts, carts, and stands, Plasma Display ceiling mounts, wall mounts, electric lifts, and carts. Chief also has a full accessory line for most installation applications.CMA-100 8" (20 cm) Square Ceiling Plate with adjustable column attaches to all NPT 1 1/2" threaded couplers. It is height-adjustable from 63 to 117 cm in 2 cm increments. For angled ceiling installations, it can be used with the CMA-120.