These Bells are constructed of improved cast brass (not lower grade spun brass). 8" Bells meets Coast Guard, ABYC, and NMMA requirements (200 cm mouth opening and striker mass no less than 3% of mass of the bell) for use on vessels 12m (39.4') to 20m (65.6') in length. Includes hanger and wall mounted bracket for easy installation. Installs with two #6 FH fasteners (not included). Chrome plated finish.