Traxxas clutch bell is constructed of 20T hardened steel Fits all Traxxas 1/10th scale nitro vehicles. Replaces worn or damaged clutch bells. Clutch attaches to the adapter unit on the crankshaft, makes contact with the clutch shoes and meshes with the main gear. INCLUDED: One Traxxas 20 Tooth Steel Replacement Clutch Bell, Two 5mm x 11mm 0.5mm fiber washers AND Two 5mm E-clips