This is a two-blade aluminum spinner with aluminum backplate from Great Planes.
Requires: One spinner adapter kit
Note: Failure to follow the instructions printed on the box may cause the propeller to separate from the model. If the spinner cone touches the propeller at any point, use a file or MotoTool to relieve this area.
Spinner Backplate Diameter: 1-3/4" (44mm)
Spinner Backplate Mounting Ring Thickness: 3/16" (4mm)
Spinner Backplate Hole Diameter: 3/8" (9.5mm) (The Adapter Kit Will Contain An Aluminum Bushing To Fit The Crankshaft Size.)
Length From Back Of Backplate To Front Of Cone: 2" (51mm)
Height Of Propeller Slot: 9/16" (14.5mm)
Length Of Propeller Slot: 5/8" (15.5mm)