Shock-absorbing black rubber
Width: 14.5 mm (0.57in)
Height: 16 mm (0.63in)
High-precision steel hub
Diameter: 9.5 mm (0.37in)
Length: 8.8 mm (0.35in)
Matching 20 mm (0.8w) stud w/ 5-40 thread
Will fit 5 x 3 3 blade prop ... spinner would have to be retained with dab of silicone or similar due to recess in that prop hub