This is the 64P 76T Precision Diff Gear from Kimbrough. FEATURES: Nylon construction Black in color INCLUDES: One Precision Diff Gear REQUIRES: Installation on vehicle SPECS: Outer Diameter: 30.8mm (1.2") Inner Diameter: 9.5mm (0.37") Width: 5.3mm (0.21") Pitch: 64 Tooth: 76 cnh 10/27/09 ir/jxs