"This NPT adapter easily adapts to a 1.5"" NPT threaded fitting to a 1"" NPT threaded column. Features - Compatible with Chief's CMA or CMS accessories, and the RPA Series projector mounts Certifications: UL Approved, UL Listed Overall Dimensions (H x W x D): 0.9"" x 1.5"" x 1.5"" (23 x 38 x 38 mm) Weight Capacity: 250 lbs (113.4 kg)"