This is the P5 Turbo Off-Road Very Hot Glow Plug from O.S. Engines.      
                                                                              
FEATURES: Very hot plug for turbo cylinder head engines such as the O.S .21   
            VZ-B V-Spec and most .18 -.28 cu in (2.9 - 4.6 cc) off-road turbo 
            head racing engines                                               
          Allows leaner needle settings and high-nitro/high RPM running, also 
            ideal when outside temperature is high                            
                                                                              
INCLUDES: One P5 Turbo Off-Road Very Hot Glow Plug                            
                                                                              
REQUIRES: Glow plug wrench, HCAP2550                                          
                                                                              
SPECS:    Overall Length: 17mm (0.67")                                        
                                                                              
COMMENTS: This glow plug is different from the conventional glow plug. It is  
           made to fit the inner head of engines with a turbo-type cylinder   
           head design