Specification Brand : Qinlorgo BulletPoint1 : Product Name : Universal Joint;Bore Diameter : 10mm/ 0.4" BulletPoint2 : Female Thread Diameter : 5mm/ 0.2";Total Size : 20 x 46mm/ 0.79" x 1.8" (Max.D*L) BulletPoint3 : Material : Metal;Color : Black BulletPoint4 : Net Weight : 70g BulletPoint5 : Package Content : 1 x Universal Joint ExternallyAssignedProductIdentifier1 : 0719233122853 ExternallyAssignedProductIdentifier2 : 719233122853 ItemName : Qinlorgo Universal Joint Motor Shaft Coupling Connector U Joint Coupler ID 14mm OD 28mm ItemPackageQuantity : 1 ItemTypeKeyword : pin-and-block-universal-joints Manufacturer : Qinlorgo Material : metal ModelNumber : modle PartNumber : Qinlorgokiaggsznrt ProductDescription : Specification: Features: brand new and high quality. Made of premium metal material, it is and has service life. This joint or coupling connects rods whose axes are inclined to each other. It is commonly used for shafts that transmit motion. Ideal accessories for RC model motor, such as model airplane, boats and robots. Specification: Material: Metal Weight: Approx.214g/ 7.5oz Length: Approx.70mm/ 2.8in Inside diameter: 14mm/ 0.55in Outside diameter: 28mm/ 1.1in Package List: 1 * Universal Joint 2 * Screw Note: Please allow slight error due to manual measurement. Thanks for your understanding.