Hadley 37 Inch Bell Air Horn (Genuine)SKU AH HAD37 Hadley 37 Inch Bell Air Horn (Genuine) The Hadley 37 Inch Air Horn is a must have for any vehicle. With its sleek chrome design and powerful sound, it adds a touch of style and safety to your ride. Expertly crafted and proven to emit a sound level of 125 decibels, this air horn is perfect for alerting others on the road. Items included in kit: 37 Inch Chromed brass horn Horn support arm and mounting bolts M12 x 1. 5 Male, Push In 6 mm