Cat parts are manufactured to precise specifications and are built for durability, reliability, productivity, less environmental impact, and reuse Mount Type: Two-Piece - Symmetric Head Outside Diameter (mm): 108.3 Head Outside Diameter (in): 4.26 Head Thickness (mm): 50 Head Thickness (in): 1.97 Pilot Outside Diameter (mm): 70.6 Pilot Outside Diameter (in): 2.78 Inside Diameter (mm): 46 Inside Diameter (in): 1.81 Mount Height (mm): 69.1 Mount Height (in): 2.72 Bonded Sleeve: No