Du-Bro Heavy Duty Control Horn System Part No: 866. Designed with BIG planes in mind! This product has plenty on clearance from the hinge line with 1-5/32" \(29.37 mm\) long control horn, the precision fit. Steel cotter pins securely hold aluminum pin in place. Bolt is a 8-32 X 2" socket head. The clevis fits a 4-40 rod \(not included\). For aircraft .91 & above.