Item Descriptions: -4Pcs motor pinion gears, 9 teeth, 0.4 M, fit for motors with a shaft diameter of 1.5mm. -Hole diameter: 1.5mm tight; Outer diameter: 4.3mm; Height:5mm -Made of copper material, and has a long service life. -Milled by a precision milling machine with fine workmanship, and the surface of the gear is hard anodized. -Used for DIY toy cars, drones, robots and other mechanical models. Package: 4x 0.4 M Motor Pinion Gear (Note: Other accessories are not include.) Item Specifications: Type:Pinion Gear Material:Copper Pressure Angle:0.4M Tooth Profile:Spur Gear Shape:Cylindrical Gear Processing:Die Casting Direction:Right Hand