HARFINGTON Mod 1 M1 Pinion Motor Gear Set 2pcs 27T 28T Fit 5mm RC Motor Shaft M1 Pitch Gears for RC Car, with Hex Key

Features:1. Mod 1 is the pitch of each tooth on the pinion gear and the 27T 28T is the number of teeth on the pinion gear. Please make sure your spur gear and pinion gear have the same pitch, or the teeth won't mesh.2. The RC car pinion gear set is made of quality 45# steel, durable and reusable, enjoy your happy RC racing time.3. Good machining made less roughness and noise than other pinion, making them roll smoothly.4. The speed depends on your gear ratio. We provide different teeth pinion gears to make you more choices in gear ratio.5. This pinion gear set is made of hardened steel, it will work with the steel spur gear. NOT work with plastic or aluminum spur gear. Firstly, you can begin with the minimum tooth. Then, upgrade to a bigger tooth, and check the motor temperatures regularly throughout the run. At last, you can control faster speed while avoiding potential risks.