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Drop-In Hidden Horn V.2 with Grills is constructed of powder coated steel and injection molded nylon. Kit includes horn plus one chrome and one white decorative billet snap-in grill. Hole size 1-7/8" x 3-3/8". At 108 decibels and a frequency (Hz) of 370±20A, this horn meets US Coast Guard's COLREGS and ABYC standard A-23 for use on vessels under 12m (39'). 12VDC. NMMA Type Accepted #2577065.