Specification Brand : uxcell BulletPoint1 : 【Type】- 3mm Hex Brass Shaft Coupling, suitable for model shaft connection, perfect accessories for RC Model motor, etc. BulletPoint2 : 【Coupling Size】- Hex Height : 6mm ; Opposite Side: 12mm ; Cylinder Height: 12mm ; Cylinder Outer Diameter: 11.5mm ; Cylinder Inner Diameter: 3mm ; Fastening Screw Hole: M4 BulletPoint3 : 【Material:】- Made of brass, sturdy, reliable and strictly functional. Durable and insulation, make your shaft more stable, easy to install and replace. BulletPoint4 : 【Function】- A special coupler, used for connecting the motor shaft and the hexagon wheel of the robot and other models. BulletPoint5 : 【Package Content】- 2pcs Hex Coupler, 4pcs M4 Screws, 1pcs 4mm Hex Wrench. Color : Brass ConnectivityProtocol : Z-Wave ConnectorType : Clamp ControllerType1 : SmartThings ControllerType2 : vera ControlMethod : application CurrentRating : 10 amps CustomerPackageType : Standard Packaging DriveSystem : External Hex ExteriorFinish : Brass ExternallyAssignedProductIdentifier1 : 024822098403 ExternallyAssignedProductIdentifier2 : 0024822098403 ExternallyAssignedProductIdentifier3 : 7426830894849 FinishType : Brass GpsrSafetyAttestation : 1 GradeRating : commercial Horsepower : 20 watts InternationalProtectionRating : IP54 ItemName : uxcell Hex Coupler 3mm Bore Motor Hex Brass Shaft Coupling Flexible Connector for Car Wheels Tires Shaft Motor 2pcs ItemPackageDimensions_Height : 18.1 centimeters ItemPackageDimensions_Length : 2.8 centimeters ItemPackageDimensions_Width : 17 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : motor-accessories Manufacturer : uxcell Material : Brass Material1 : carbon Material2 : Metal MetalType : Brass ModelName : FBA_45710 ModelNumber : a13122000ux0757 MountingType : Wall Mount NumberOfItems : 1 NumberOfPieces : 2 OperatingVoltage : 120 volts OperationMode : ON-OFF PartNumber : a19120400ux0031 ProductDescription : Description : 1.Material: Made of pure brass, sturdy, reliable and strictly functional. 2.Function: A special coupler, used for connecting the motor shaft and the hexagon wheel of the robot, cars, and other models. 3.Use: Suitable for model shaft connection, perfect accessories for RC Model motor, etc. 4.Feature: Durable and insulation, make your shaft more stable, easy to install and replace.