Stockbridge Vibration Damper For 4D-20 , the suitable Al . Clamps including : 27.0, 23.4, 20.3, 18.0, 16.0, 14.0For 4D-30 , the suitable Al . Clamps including : 34.0, 30.5, 27.6, 27.0, 23.4, 20.3, 18.0, 16.0, 14.0 For 4D-40 , the suitable Al . Clamps including : 34.0, 30.5, 27.6, 27.0, 23.4, 20.3 Stockbridge Vibration Damper