I found this in a cellar clean out. For three blade props. Very hard to find. Perfect for any .60 size 109
Diameter: 3 5/8"
Depth: 2 1/2'
Diameter at nose flat: 1 1/8"
Note: for people that don't know about Royal aluminum spinners, they are not like conventional spinners with a back plate going on the shaft first. The back plate is actually a top plate and mounts on top of the prop under the washer and prop nut. Once this is mounted then the nose cone is screwed on top the top plate.