Specification Brand : uxcell BulletPoint1 : Connection Bore Diameter: 4mm to 5mm; Total Size: 25x14mm/0.98''x0.55''(LxD). BulletPoint2 : Top tight type rigid coupling,high torque with rigidity, low inertia and excellent sensitivity. BulletPoint3 : No rotation gap, elastic action can make up for symmetrical angular misalignment, maintenance-free, oil proof and corrosion resistance. BulletPoint4 : NOTE: The rigid type basically does not allow eccentricity, and it must be fully adjusted during use. BulletPoint5 : Package Content : 1 x Rigid Shaft Coupler, 1 x Hexagon Wrench, 4 x Screw. Color : Blue DriveSystem : External Hex ExteriorFinish : Aluminum ExternallyAssignedProductIdentifier : 9406106304478 ExternallyAssignedProductIdentifier1 : 712662659549 ExternallyAssignedProductIdentifier2 : 0712662659549 ExternallyAssignedProductIdentifier3 : 00712662659549 ItemName : uxcell 4mm to 5mm Bore Rigid Coupling 25mm Length 14mm Diameter Shaft Connectors Coupler Aluminum Alloy Blue ItemPackageDimensions_Height : 7.4 centimeters ItemPackageDimensions_Length : 1.2 centimeters ItemPackageDimensions_Width : 4 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : set-screw-couplings Manufacturer : uxcell Material : Aluminum MetalType : Aluminum ModelNumber : a15102700ux1209 NumberOfItems : 1 PartNumber : a15102700ux1209 ProductDescription : Function: Shaft coupling is a type of coupling that connects two shafts together in order to transmit torque and rotational motion. Material: This shaft coupling is constructed from carbon steel with a black oxide coating, which provides corrosion resistance and ensures durability and long-lasting performance. Easy Installation: With its simple design and included installation instructions, this shaft coupling can be easily installed. Wide Range of Applications: Whether you need to connect motors, pumps, generators, or other rotating equipment, this shaft coupling provides a reliable connection for efficient power transmission.