Du-Bro Heavy Duty Dual Control Horn Part No: 3352. This new control horn design is made from high strength nylon and is perfect for large aircraft. The dual arm feature allows for even, in-line movement of the control rod. Includes a 1" (25.4 mm) square support plate with socket head mounting bolts and a heavy duty swivel ball link for 4-40 control rod. Height from the base to the pivot center is 1" (25.4 mm). Distance from the base outward to the pivot center is 1/2" (12.7 mm).