This is the 8x1.0mm Double Jam Nut Adapter Kit from Tru-Turn.         
                                                                               
FEATURES: Steel construction.                                                  
          The screw is tapped 10-32 for cone screw.                            
          Used to mount Tru-Turn aluminum spinners onto the following engines: 
            YS .90, 1.20, 1.40 4-Stroke Engines                                
                                                                               
INCLUDES: One Adapter Nut                                                      
          One Adapter Jam Nut                                                  
          One Propeller Washer                                                 
          One Aluminum Bushing                                                 
                                                                               
REQUIRES: 1/2" End Wrench To Tighten                                           
          Tru Turn Aluminum Spinner                                            
                                                                               
SPECS:    Crankshaft Thread Size: 8 x 1.0mm                                    
          Spinner Mounting Bolt Thread Size: 10-32                             
          Bushing Size: Inner: 8mm   Outer: 3/8"           

COMMENTS: Will Not Fit Smaller Than 2-1/2", Too Small.