This is the optional 34 Tooth 48 Pitch Pinion Gear for the HPI Switch On-Road Car. FEATURES: Constructed of steel YOU WILL RECEIVE: 34 Tooth 48 Pitch Pinion Gear REQUIREMENTS: Installing on motor shaft and tightening set screw SPECIFICATIONS: Diameter of Hole: 1/8" (3mm) Number of Teeth: 34 Pitch: 48 jxs 12/15/11 ir/jxs &