Product Name: 10 Teeth RS555/RS550 DC Motor Gear Teeth: 10 Teeth Shaft Diameter: 3.2mm Commutation: Brush Gear Thickness: about 13mm Rotation Direction: CW/CCW Installation Screw Spacing: 25mm Gear Diameter: about 8.6mm(Fine Teeh), 9.6mm(Medium Teeth), 10mm (Coarse Teeth) Installation Screw Size: M3 (Not included) Power: 200W Voltage: 24V DC Speed:12000RPM/18000RPM/30000RPM/40000RPM Features: Pure copper coil, high speed, excellent heat dissipation performance, stable performance. Easy to use, the front can be fixed with 2 M3 screws(Not included). Specially customized for car modification (High Speed), applied to specific children riding toys. Note: 10 teeth gear divided into fine teeth(about Diameter: 8.6mm, Length: 13.2mm), medium teeth(about Diameter: 9.6mm, Length: 10.6mm), and coarse teeth(about Diameter: 10mm, Length: 13mm). The gears of this style are coarse teeth, please verify and confirm carefully. Confirm the number of teeth of your motor, make sure to choose the motor with the same number of teeth, and verify that the outer diameter and thickness of the gears are the same or similar. Confirm your motor model is RS550/RS555 or motor size match. Confirm the voltage of your motor and choose a motor with the same or similar voltage. Product Weight: 235 G Color: Silver Material: Copper Package Contents: 1 x 10 Teeth RS550 DC Motor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.