Traxxas 2419 19-T Pinion Gear 48P Optional Traxxas pinion gears allow you to increase or decrease the final drive ratio and tune for different applications Designed for use with 48-pitch spur gears; fits 3mm motor shafts Durable metal construction for long-lasting performance Includes set screw; one gear per package designed for use with 48-pitch spur gears and 3mm motor shafts Use Traxxas stock and hop-up replacement parts to get the most out of you Traxxas RTR vehicles! This product is made from high quality materials, and designed for lasting performance. This is replacement hardware for use on Traxxas vehicles, consult your user's manual for exact parts listings.