Wolo’s 370 series electro-mechanical industrial horn is designed with state-of-the-art technology. Engineered to meet the heavy-duty requirements of material handling equipment. The 370 series is constructed of all metal, with a durable painted black finish. Terminals can be either screw type, 1/4" push-on or two terminals per pole using screw post and 1/4" push-on. The diameter is 123 mm.  U.L. Registered.