This kit includes piston rings and spacers to repair an air compressor Mount Type: Two-Piece - Symmetric Head Outside Diameter (mm): 68.6 Head Outside Diameter (in): 2.7 Head Thickness (mm): 6.8 Head Thickness (in): 0.27 Pilot Outside Diameter (mm): 48 Pilot Outside Diameter (in): 1.89 Inside Diameter (mm): 14.3 Inside Diameter (in): 0.56 Mount Height (mm): 13.2 Mount Height (in): 0.52 Bonded Sleeve: Yes