Cat parts are manufactured to precise specifications and are built for durability, reliability, productivity, less environmental impact, and reuse Overall Length (mm): 60.0 Overall Length (in): 2.36 Head Outside Diameter (mm): 90.0 Head Outside Diameter (in): 3.54 Pilot Outside Diameter (mm): 50.0 Pilot Outside Diameter (in): 1.97 Inside Diameter (mm): 31.0 Inside Diameter (in): 1.22