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): 56.4 Head Outside Diameter (in): 2.22 Head Thickness (mm): 20.5 Head Thickness (in): 0.81 Pilot Outside Diameter (mm): 35.1 Pilot Outside Diameter (in): 1.38 Inside Diameter (mm): 13.5 Inside Diameter (in): 0.53 Mount Height (mm): 28.4 Mount Height (in): 1.12 Bonded Sleeve: No Standard Bolt Size: M12