Cat fuel injector nozzles utilize specialized product metallurgy, proprietary manufacturing processes and design, to deliver injectors capable of meeting today's performance and injection pressures for emissions requirements. Mount Type: Two-Piece - Symmetric Head Outside Diameter (mm): 51 Head Outside Diameter (in): 2.01 Head Thickness (mm): 14 Head Thickness (in): 0.55 Pilot Outside Diameter (mm): 38 Pilot Outside Diameter (in): 1.5 Inside Diameter (mm): 19 Inside Diameter (in): 0.75 Mount Height (mm): 44.5 Mount Height (in): 1.75 Bonded Sleeve: Yes