The CMA643 is a decorative finishing trim ring for the outside of our CMS adjustable extension column pipe. Features: Finishing ring visually enhances suspended ceiling installations by covering the hole where the column passes through the ceiling tile Hinged for new of retrofit installations ID of finish ring is 2.44" (62 mm) Specifications: Certifications: UL Listed Color: Silver Overall Dimensions (HxWxD): 1.8" x 4.7" x 4.7" Shipping Weight: 0.25 lbs