Advanced oxidation aviation aluminum paddle clamp. Solid material and reliable quality Aperture: 3.0-5 (motor shaft) output shaft diameter: 5mm Aperture: 3.17-5 (motor shaft) output shaft diameter: 5mm Aperture: 3.0-6 (motor shaft) output shaft diameter: 6mm Aperture: 3.17-6 (motor shaft) output shaft diameter: 6mm Aperture: 4.0-6 (motor shaft) output shaft diameter: 6mm