This is the 10x1.25mm Standard Adapter Kit from Tru-Turn.

FEATURES: Steel construction.
          Tapped 10-32 for cone screw.
          Used to mount Tru-Turn aluminum spinners onto the following engines:
            SuperTigre 2000 to 3000 (use TRUQ3060 for the G2300 engine)

INCLUDES: One Prop Nut
          One Washer

REQUIRES: 9/16" End Wrench To Tighten
          Tru Turn Aluminum Spinner

SPECS:    Crankshaft Thread Size: 10 x 1.25mm
          Spinner Mounting Bolt Thread Size: 10-32

COMMENTS: While This Adapter Does Not Use A Bushing, It Is REQUIRED That Some
            Modifications Be Made To The Spinner Backplate.  The Backplate
            Must Be Reamed Out To 10mm (.394) For 2000 to 3250, and 12mm (.473)
            For G4500 Engines.  This Must Done Accurately!
          Use The SuperTigre Aluminum Washer Under Your Tru Turn Adapter Nut
            and Washer, Then Check Closely For Threads Bottoming Out Or
            Interfering.
          Tru Turn Will Modify Backplate For A Small Fee and Postage Paid.
          The 10-32 Bolt That Is Included With The Spinner Might Require
            Cutting, Depending On The Prop Used.
                                                                    JAL 5/19/99
                                                                          ir/jl