Specification Brand : daier BulletPoint1 : Thread Size: M3; Length: 20mm/0.79 inch; Outer Diameter: 9mm/0.35 inch; Inner Hole Dia :3mm-4mm. BulletPoint2 : Material: Made of brass, this shaft coupling is maintenance-free, oil-proof, and resistant to corrosion for long-lasting use. this coupling joint connector ensures long-term structural integrity and reliable performance. BulletPoint3 : Advantage: With a top-tight type rigid coupling, this shaft connector delivers high torque and rigidity, low inertia, and excellent sensitivity. BulletPoint4 : Application: Ideal for use in metal, mold, and mechanical drive applications, this coupler is perfect for automotive tires, RC models, airplanes, boats, electric cars, and toys. BulletPoint5 : Package include: 12 x Motor Shaft Coupling Connector;2 x Allen Wrench;48 x Screws Color : silver DriveSystem : External Hex ExteriorFinish : Brass ExternallyAssignedProductIdentifier1 : 744337424114 ExternallyAssignedProductIdentifier2 : 0744337424114 FinishType : Unfinished GpsrSafetyAttestation : 1 GradeRating : industrial ItemDisplayWeight : 0.14 kilograms ItemName : 12Pcs 3mm to 4mm Brass Shaft Coupling Joint Connector, Motor Shaft Coupling for RC DIY Airplane Boat Robot ItemPackageDimensions_Height : 12.5 centimeters ItemPackageDimensions_Length : 1.6 centimeters ItemPackageDimensions_Width : 7.7 centimeters ItemPackageQuantity : 12 ItemTypeKeyword : set-screw-couplings Manufacturer : daier Material : Brass MeasurementSystem1 : Metric MeasurementSystem2 : Inch MetalType : Brass MetalType1 : Alloy Steel MetalType2 : Brass ModelNumber : mea220111ee0463 NumberOfItems : 12 NumberOfPieces : 12 PartNumber : T790 ProductDescription : Descriptions: 12Pcs brass joint motor shaft coupling adapters, ideal accessories for RC Model motor, such as airplane boat model. Fit for connecting two axis with different diameters, can also be connected with a motor axis, or connecting shafts of different diameters. Simple structure, selected high-quality material,and easy to assemble. Commonly used for shafts that transmit rotary motion, widely used in metal, mold, mechanical drive applications. ProductSiteLaunchDate : 2023-04-07T01:33:10.062Z Size : 3mm to 4mm Style : 7mm to 7mm SupplierDeclaredDgHzRegulation : not_applicable UnspscCode : 31161700