Great Planes Spinner 2-1/4" Aluminum

This is a Two-Blade Aluminum Spinner w/Aluminum Backplate from Great Planes.

FEATURES:
Machined For Accuracy, Then Refined To A Gleaming Finish.
Easy To Set up, Having A Bolt-On Style, Centers Each Spinner
    Completely On Its Baseplate.
Spinner Cone Is Recessed To Mate Into the Spinner Backplate. The Back
    Of The Spinner Is Flat, Without An Overhanging Cone.
Includes Black 10-32 Bolt That Holds Spinner Cone to Backplate.
Adapter Kits For Different Engine Sizes Are Available Separately.
    (See COMMENTS)

CONSISTS OF:
One Aluminum Spinner Cone
One Aluminum Backplate (See Specifications For Sizes)
One 10-32 x 1" Mounting Bolt
One Box with Setup Directions and Safety Tips

REQUIRES:
One Spinner Adapter Kit (See COMMENTS)

SPECS:
Spinner Backplate Diameter: 2-1/4" (57mm)
Spinner Backplate Mounting Ring Density: 3/16" (4mm)
Spinner Backplate Hole Diameter: 3/8" (9.5mm)
    (The Adapter Kit Will Consist of An Aluminum Bushing To Fit The
Crankshaft Size.)
Length From Back Of Backplate To Front Of Cone: 2-1/4" (57mm)
Height Of Prop Slot: 3/4" (19mm)
Length Of Prop Slot: 13/16" (21mm)

COMMENTS:
Caution: Failure To Follow The Recommendations Printed On Package May
    Cause The Prop To Separate From The Model.
If The Spinner Cone Touches The Prop At Any Point, Use A File
    Or MotoTool To Alleviate This Area.
Spinner Adapter Kit To Use Will Be Determined By Engine Crankshaft
    Size. Use One Of The Following:
    GPMQ4581 - OS Max 20-40 FP, 25-46 FX & SF (1/4")
    GPMQ4584 - OS Max 60 FP, 61 FX & SF, SuperTigre 61 (5/16")
    GPMQ4585 - OS Max FS 26-52 Go beyond (1/4")
    GPMQ4588 - OS Max FS 70-120 Go beyond, 140 RX (5/16")
    GPMQ4589 - OS Max 1.08 FSR (3/8")
    GPMQ4590 - SuperTigre S 2500-4500 (10mm)