APC 4.1x4.1 Speed 400 electric propeller. For use on Electric powered aircraft only, not for glow powered engines. Constructed of gray composite material. For Speed 400 motor applications. Two adapter rings that adapt to different motor shafts.
Diameter: 4.1" Pitch: 4.1 Hub Inner Diameter: (8mm) where rings are installed Inner Diameter of Rings: 3/16" (4.9mm) and 1/4" (6mm)