The Dubro Clevis Horn System 10-32 Heavy Duty #3356 is a complete mounting system for large aircraft that can be configured as a pull-pull or as two single control horns. The self-adjusting design will mount at 90º to the center line of the control surface. This system includes premium socket head bolts which provide a non-slip head while installing horns. The clevis horns include 4-40 heavy duty swivel ball links for “no-slop” precision control. (1 Piece)