16.5inch diameter rotation of arms to easily fit a projector. The clamp style braket models wrap around the projector. The flat arm styles match up with the mounting holes on the bottom of the projector. All steel construction with attractive black powder coat finish. 10 degree tilt capability. WCFLCDM has a fixed 6inch pipe extension from the ceiling mount and the mountin claws are adjustable from 3.5inch to 6.5inch which will accommodate most LCD projectors.