Specification Amperage : 20 amps Brand : uxcell BulletPoint1 : 【Type】- 5mm 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: 5mm ; 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】- 4pcs Hex Coupler, 8pcs M4 Screws, 2pcs 4mm Hex Wrench. BulletPoint6 : This product is a medium-to-large machine (weighing more than 100lbs), and the lift gate service is a service to help unload the goods, not a freight charge. In order to ensure that the goods are delivered smoothly, I am asking here on behalf of the carrier. It is not a mandatory purchase, please purchase it as needed. If you have an unloading method, please ignore the above information. I hope you can understand. Color : Blue and White DriveSystem : External Hex ExteriorFinish : Brass ExternallyAssignedProductIdentifier1 : 720707933851 ExternallyAssignedProductIdentifier2 : 0720707933851 FinishType : Brass ItemDisplayWeight : 500 pounds ItemName : uxcell Hex Coupler 5mm Bore Motor Hex Brass Shaft Coupling Connector for Car Wheels Tires Shaft Motor 4pcs ItemPackageDimensions_Height : 13.4874 centimeters ItemPackageDimensions_Length : 1.4986 centimeters ItemPackageDimensions_Width : 9.7028 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : power-rotary-tools Manufacturer : uxcell Material : Metal MaximumPower : 2500 watts MetalType : Brass ModelName : EB-4816M ModelNumber : 173408V220 NumberOfPieces : 4 PartNumber : a19120400ux0038 PowerSourceType : ac 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.