This is the Heli-Max One-Way Starter Shaft with 6mm Hex Size.        
                                                                              
FEATURES: Orange anodized alumium base with factory installed one-way bearing 
          Steel shaft with 6mm hex is secured to the base with a 4x4mm set    
           screw (requires a 2mm hex wrench for removal - GPMR8011)           
          Press-fits into a standard rubber starter insert                    
                                                                              
INCLUDES: 1- One-Way Starter Shaft with 6mm size hex                          
                                                                              
REQUIRES: An engine starter with standard size Spinner Insert                 
                                                                              
SPECS:    Length:  10.8" (275mm) overall with base and shaft                  
          Diameter:   1"  (25mm) base                                         
          Hex: 6mm