Novak 5161 Steel Pinion Gear (3-Pack), 5mm, 32P, 15T/16T/17T FEATURES: Designed to mesh with the Novak HV series of brushless motors (#3524-3527) and other brushless motors with a 5mm output shaft These shafts w INCLUDES: One each 15 tooth, 16 tooth and 17 tooth pinion gears and three 4x4mm set screws REQUIRES: Installing on motor shaft and tightening set screw jxs 1/13/09 ir/jxs