Universal Mount J Block Prairie White provides multiple uses, including the ability to easily and attractively mount lighting fixtures and 7 x 7 inch receptacles. Surface dimensions are 812 x 712 inches, with a 34-inch flange adjustable to 114 inches. The J-channel ID is 4 inches in diameter and measures 238 inches x 334 inches. Features a limited lifetime warranty and multiple depth options. Universal Mount J Block Prairie White Specifications: Dimensions: 1 x 1 x 1 inches. Color: Prairie Wheat. Weight: 0.5 lbs