Versatile Coupling: Flange Coupling Connector provides a more secure connection for keyed shafts, works seamlessly with omni wheels, and enhances the functionality of your robot or mechanical system Zinc Alloy Construction: Flange Coupling is made of zinc alloy to ensure reliable performance in a variety of applications. Package: Contains 1 Flange Shaft Coupling to meet your project or repair needs Function: Motors Guide Shaft Support Coupler can fix the shaft to a flat surface and easily install other accessories Premium: Shaft Axis Fittings is professionally manufactured for stable performance and long service life Specification: Material: Zinc Alloy Size Chart:Outer diameter 5.68cm/2.24inch, hole diameter 1.8cm/0.71inch Package Includes: 1 Flange Coupling Note: Please allow slightly errors due to manual measurement and different monitors.