API 645 Bird Bath Bowl with Tilt-to-Clean Deck Rail Mounting Bracket. The bowl is 20" x 2" deep. The shape of the rim is designed to be easily grasped by a bird's talons making it a natural perch and, as a result, encourages landings. Includes a mounting bracket that firmly attaches to deck rails. The bath can be tilted for cleaning without removing it from the rail.