Specification Brand : uxcell BulletPoint1 : Product Name: Plastic Gear; Type: Single Gear; Fit for: for DIY Motor Gearbox Shaft BulletPoint2 : Teeth : 9;Modulus : 0.5;Total Dia : 5.5mm/0.22" BulletPoint3 : Thickness : 5mm/0.2";for Shaft Dia : 2mm/0.08" BulletPoint4 : Material : Plastic;Color : White BulletPoint5 : Weight : 6g;Package Content : 50(±2%)Pcs x Plastic Gear BulletPoint6 : LED display screen shows the motor speed from 0 to 100 percent of the rated speed. Accurate adjustment speed. Adjust output current control motor speed. Color : Black ExternallyAssignedProductIdentifier1 : 702105061770 ExternallyAssignedProductIdentifier2 : 0702105061770 ExternallyAssignedProductIdentifier3 : 00702105061770 GradeRating : Industrial IncludedComponents : 1 Pcs DC Motor Speed Controller ItemForm : Rod ItemName : uxcell 50 Pcs 0.5 Modulus 9-Teeth Plastic Gear Cog for 2mm RC Motor Shaft ItemPackageDimensions_Height : 0.762 centimeters ItemPackageDimensions_Length : 7.0612 centimeters ItemPackageDimensions_Width : 3.81 centimeters ItemPackageQuantity : 1 ItemShape : Rectangular ItemTypeKeyword : electric-motor-controls Manufacturer : uxcell Material : Plastic ModelNumber : a14031300ux0108 NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : a14031300ux0108 ProductDescription : This is a plastic gear building your own gearbox with customized gear rate. The outer gear diameter is 5.5mm with 9 teeth. The motor shaft diameter is 2mm. It can be connected with Motor axle diameter 2.0mm . suit accessories for Vehicle or remote control