Flush Mount Mini Compact Horn Features Includes 431235 horn plus 431411 chrome grill and 431412 white grill V.2 horn meets ABYC standard A-23. For use on vessels under 39' 12 VDC Required hole size, 1-7/8" X 3-3/8" Frequency (Hz)-370 & 20 Specifications Dimension: 10" H x 4.5" W x 7.25" L Weight: 0.72 lbs