This product is a 20-tooth clutch bell designed to deliver efficient power transfer and precise gear engagement for nitro RC vehicles. It is manufactured from hardened steel to provide increased durability and resistance to wear under high-temperature operating conditions. The precision-machined teeth ensure smooth mesh with the spur gear for consistent acceleration and performance. It is compatible with Traxxas nitro models including T-Maxx, Revo, and other configurations that use part 4120 clutch bell.