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Tekno R/C TKR4181 "M5" Hardened Steel 5mm Bore Mod 1 Pinion Gear (21T) NSR Traxxas Clutch Bell 15T/Fiber Washer/E-ClipTekno RC TKR4181 Pinion Gear 21T M5(MOD1 5mm Bore M5 Set Scrw) 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 Specs: Number of Teeth: 21 Gear Pitch: MOD1 Hole Diameter (Bore): 5mm