The 20-tooth (32-pitch) clutch bell is made from durable steel for long-lasting performance. Includes 5x8x.5 mm fiber washers (2) and 5 mm E-Clips (2). Clutch bells are available in a variety of sizes to fine-tune your truck's gear ratios for more torque or higher top speed. (Requires two 5x8x2.5 mm ball bearings)