This is a 23 Tooth 48 Pitch Pinion Gear By Traxxas FEATURES: Pinion gear with set screw, Silver in color YOU WILL RECEIVE: (1) 23 Tooth 48 Pitch Pinion Gear (1) One 4mmx2mm set screw REQUIREMENTS: Installation SPECIFICATIONS: Outer Diameter: 14mm (9/16") Inner Diameter: 11mm (7/16") sgh 9/27/06 &