Chief's CMA-395 Angled Ceiling Plate adjusts from -5 degrees to +95 degrees to level an angled ceiling. It accepts a standard 1 ½" NPT threaded extension column. Three slotted mounting holes allow horizontal and vertical adjustment for a precise installation. Includes set screw. Dimensions are 4 1/4" H x 3" W x 7 1/2" L and weight capacity is 500 pounds