This is the 67 Tooth 48 Pitch Spur Gear for use on the HPI Cup Racer 1M Vehicles. FEATURES: High precision Lightweight delrin construction INCLUDES: One 67T 48P Spur Gear REQUIRES: Installation on the vehicle SPECS: Outer Diameter: 36.45mm (1.4") Inner Diameter: 9.5mm (0.37") Width: 4.6mm (0.18") cnh 7/15/09 ir/jxs