This is the 21 Tooth M5 Pinion Gear from Tekno RC.               
                                                                               
FEATURES: Ideal for 1/8 scale and other MOD1 pinion applications               
          Constructed of CNC machined steel, lightened and hardened for        
            durability                                                         
          Standard length shank                                                
          Number of teeth laser etched on shaft                                
                                                                               
INCLUDES: 21 Tooth Pinion Gear, M5 Set Screw                                   
                                                                               
REQUIRES: Installing on motor shaft and securing with set screw                
                                                                               
SPECS:    Number of Teeth: 21                                                  
          Gear Pitch: MOD1                                                     
          Hole Diameter (Bore): 5mm