Robart 327 Ball Link Control Horn 1/2" (2) This is a 1/2" High Nylon Ball link control horn by Robart. FEATURES Grey nylon construction. INCLUDES Two nylon control horns with installed balls. Two nylon backplates Six mounting screws 2x16.5mm REQUIREMENTS Linkages SPECIFICATIONS Height: 15.2mm (.602") Width: 12.6mm (4.99") Overall length: 25.3mm (1.0") COMMENTS This horn will provide control motion in two planes so that you do not need to bend your control horns and so that there is no binding on your control surfaces.