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HackFab aluminum mini pinion gears are made for those micro and mini r/c vehicles that have a motor with a 2mm output shaft and use a .5 Mod (M0.5) pitch spur gear. This includes many 1/16, 1/18, and 1/24 models such as the Losi Mini-B, Mini-T 2.0, Mini JRX as well as the Losi Micro-B and Micro T (assuming you've swapped motors to something brushless that has a 2mm shaft).
Made from aluminum they are lightweight allowing optimal performance. Includes a setscrew that is 1.3mm hex drive. Replacement set screws are also available (HFB05200).
Available in a wide range of tooth count to fit almost any need.