Motor Coupling 5mm To 10mm Bore Rigid Coupling 25mm Length 20mm Rigid Shaft Coupler NOTE: The rigid type basically does not allow eccentricity, and it must be fully adjusted during use. Thanks for your understanding Specification:4 pcs screws designThread Size: M4Color: Gold ToneMaterial: CopperConnection Diameter: 10mm to 10mmTotal Length: 22mm /0., 87 inchOutside Diameter : 16mm/ 0., 63 inchThrough Angle: 90 Degree Package List:1 Pcs x Rigid Shaft Coupler4 Pcs x M4 ScrewsDescription:Made from copper material to reduce inertiaRigid coupling,high torque with rigidity,low inertia and excellent sensitivityNo rotation gap, elastic action can make up for symmetrical angular misalignmentMaintenance-free, oil proof and corrosion resistanceSuitable for model car, model boat, hardware, , mechanical drive situations etc Note:Please allow 1-3mm differs due to manual measurementDue to the different display and different light, the picture may not reflect the actual color of the item. Uxcell 10mm ID Copper Coupling Fittings, 12 Pcs Rolled Tube Stop Straight Pipe Fitting Welding Joint For Hvac Similar to rigid clamp couplings, shaft couplers are used to hold bearings and sprockets tightly on the shaft, and are used in motor and gearbox assemblies. Sourcing Map 10mm To 10mm Bore Rigid Coupling Set Screw L22XD16 45# Steel,Shaft Coupler Connector For 3D Printers, Motor Accessories Widely used in blowers,3D printer,DIY robots,CNC machine,stepper motors,etc.