1、17T-28T pinions are suitable for gearbox combination motor. 2、Made of high quality material, and the package includes fixed screws. 3、Adopt metal structure, which is durable in use and ensures long product life. 4、The surface of the pinion had been through rust-proof treatment. 5、Fit for 1/10 1/8 RC off-road car with 5.0mm diameter motor shaft. Item Type: Pinion set for RC car M: 0.6 Number of Teeth: 17T, 18T, 19T, 20T, 21T, 22T, 23T, 24T, 25T, 26T, 27T, 28T Teeth Height: Approx. 9mm/0.35in Applicable Shaft Diameter: 5.0mm/0.20in Size: A1 version chrome steel black HRC42-38 M0.6 17T ￠5*￠ approx. 11.4x9mm/0.45x0.35in RoHS A1 version chrome steel black HRC42-38 M0.6 18T ￠5*￠ approx. 12x9mm/0.47x0.35in RoHS A1 version chrome steel black HRC42-38 M0.6 19T ￠5*￠ approx. 12.6x9mm/0.5x0.35in RoHS A1 version chrome steel black HRC42-38 M0.6 20T ￠5*￠ approx. 13.2x9mm/0.52x0.35in RoHS A1 version chrome steel black HRC42-38 M0.6 21T ￠5*￠ approx. 13.8x9mm/0.54x0.35in RoHS A1 version chrome steel black HRC42-38 M0.6 22T ￠5*￠ approx. 14.4x9mm/0.57x0.35in RoHS A1 version chrome steel black HRC42-38 M0.6 23T ￠5*￠ approx. 15x9mm/ 0.59x0.35in RoHS A1 version chrome steel black HRC42-38 M0.6 24T ￠5*￠ approx. 15.6x9mm/0.61x0.35in RoHS A1 version chrome steel black HRC42-38 M0.6 25T ￠5*￠ approx. 16.2x9mm/0.64x0.35in RoHS A1 version chrome steel black HRC42-38 M0.6 26T ￠5*￠ approx. 16.8x9mm/0.66x0.35in RoHS A1 version chrome steel black HRC42-38 M0.6 27T ￠5*￠ approx. 17.4x9mm/0.69x0.35in RoHS A1 version chrome steel black HRC42-38 M0.6 28T ￠5*￠ approx. 18x9mm/0.71x0.35in RoHS Fitment: Fit for 1/10 1/8 RC off-road car with 5.0mm diameter motor shaft 3 x Gear 3 x Screw Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.