API 645 Unheated Bird Bath Bowl with Tilt-to-Clean Deck Rail Mounting Bracket Practical birdbath with tilting mount from API, Inc. Basin is constructed in plastic with a rim designed for natural talon gripping Basin mounts a screw-clamp bracket that fits deck railings; no tools needed for installation Hinged mount allows users to tilt the basin to dump out dirty water for simple pool refreshing The bath measures 20 inches in diameter with a 2-inch depth; this item weighs 4.9 pounds upon shipping