Description 4mm Flange Coupling Steel Rigid Flange Plate Shaft Connector Optical Axis Support Fixed Seat Specification Material SteelInner Hole Size 4mmOuter Diameter 10mm 22mmTotal Height 12mmScrew Size M3Quantity 1pc Features 4mm Flange Coupling Rigid Flange Disc Shaft Couplings Optical Axis Support Fixed Seat Easy to install and replace Durable and insulation This seat could make your shaft more stable Package Included 1pc x 4mm Flange Coupling Notice 1 Please allow a bit error due to manual measurement please make sure you do not mind before you bid 2 The color may have different as the difference display pls understand More Details