Great Planes Spinner 2-1/2" Aluminum

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

FEATURES:
Machined For Precision, Then Sleek To A Gleaming Finish.
Easy To Set up, Having A Bolt-On Design, Centers Each Spinner
    Perfectly 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 Offered Separately.
    (See COMMENTS)

INCLUDES:
One Aluminum Spinner Cone
One Aluminum Backplate (See Specs For Sizes)
One 10-32 x 1-1/2" Mounting Bolt
One Box with Installation Directions and Safety Tips

NEEDS:
One Spinner Adapter Set (See COMMENTS)

SPECS:
Spinner Backplate Size: 2-1/2" (64mm)
Spinner Backplate Mounting Ring Density: 3/16" (4mm)
Spinner Backplate Hole Size: 3/8" (9.5mm)
    (The Adapter Set Will Contain An Aluminum Bushing To Fit The
Crankshaft Size.)
Length From Back Of Backplate To Front Of Cone: 2-1/2" (64mm)
Height Of Prop Slot: 3/4" (19mm)
Length Of Prop Slot: 7/8" (22mm)

COMMENTS:
Warning: Failure To Follow The Instructions 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 Ease This Area.
Spinner Adapter Set 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)