Great Planes 2-1/2" Aluminum Spinner

 This is a Two-Blade Aluminum Spinner w/Aluminum Backplate from Great Planes.                                                                                 FEATURES: Machined For Accuracy, Then Polished To A Gleaming Finish.                     Easy To Install, Having A Bolt-On Design, Centers Each Spinner                   Perfectly On Its Baseplate.                                                  Spinner Cone Is Recessed To Mate Into the Spinner Backplate.  The                Rear 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)                                                                                                                                    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 Instructions and Safety Tips                                                                                              REQUIRES: One Spinner Adapter Kit (See COMMENTS)                                                                                                              SPECS:    Spinner Backplate Diameter:               2-1/2" (64mm)                        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: 2-1/2" (64mm)                  Height Of Propeller Slot: 3/4" (19mm)                                          Length Of Propeller Slot: 7/8" (22mm)                                                                                                               COMMENTS: Warning: 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 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 Surpass                 (1/4")                      GPMQ4588 - OS Max FS 70-120 Surpass, 140 RX        (5/16")                     GPMQ4589 - OS Max 1.08 FSR                         (3/8")                      GPMQ4590 - SuperTigre S 2500-4500                  (10mm)