Description: For 5mm Shaft 1/8 brushless brushed RC Car Motor hard anodized motor on the surface of the gear The anti-rust treatment on the gear surface The gears are ground by precisely An M4 adjustment screw (12.9 level) has been added to Each pinion Size Chart: Height: 14mm/0.55inch 15 T Diameter: 17mm/0.67inch 16 T Diameter: 18mm/0.71inch 17 T Diameter: 19mm/0.75inch 18 T Diameter: 20mm/0.79inch 19 T Diameter: 21mm/0.83inch Package Includes: 5 Pieces Motor Gear(15T 16T 17T 18T 19T)