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): 86 Head Outside Diameter (in): 3.39 Head Thickness (mm): 15 Head Thickness (in): 0.59 Pilot Outside Diameter (mm): 60.5 Pilot Outside Diameter (in): 2.38 Inside Diameter (mm): 31.8 Inside Diameter (in): 1.25 Mount Height (mm): 81.5 Mount Height (in): 3.21 Bonded Sleeve: Yes