<br>Specifications: <br>Material: brass <br>Color: golden <br>Hexagon coupler size: <br>inside diameter：0.275 ''/ 7 mm <br>Outer diameter：0.452 ''/ 11.5 mm <br>height：0.708 ''/ 18 mm <br>Hexagon width: 0.472 ''/ 12 mm <br>Screw holes: M4 <br><br>Support for any of the motor shaft diameters of 7 mm. <br><br>Flexible Coupling Coupler Connector for connecting motor shaft and hex wheel tires, DC motors, robots, etc. <br><br>Package Included : <br>10 pcs shaft motor flexible coupling coupler <br>20 pcs Screws <br> 2 pcs Allen Wrench