Sea Dog Drop-In Hidden Boat Horn V.2 w Grills Sea Dog Drop-in V.2 Hidden Boat Horn is constructed of powder-coated steel and injection molded nylon. At 108 decibels and a frequency Hz of 37020A, this horn meets ABYC standard A-23. Included is horn plus one chrome and one white decorative billet snap-in grills. V.2 horn meets ABYC standard A-23 For use on vessels under 39 12 VDC Powder Coated SteelInjection Molded Nylon Requires 1-78 x 3-38 hole size Included 1 Horn 1 White Snap-in Grill 1 Chrome