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High precision and hardness: The lateral fastening screws are all M4 screws and the fixing screws for the center hole of the hexagon are all M4 screws, too. One size fits most: The flexible coupling connector can fit most of the motor shaft whose diameter is 7 mm. Please check the size before purchase. Wide application: Flexible coupling connectors are widely used to connect motor shafts and hex wheels, they are commonly used in toy cars, robots, etc.. Comes with A Box: A free box for easy collect and fetch, help you to always keep the coupler connector organized to avoid these small items from getting lost. Specifications: Material: brass Color: golden Hexagon coupler size: Inside diameter:0.275 ''/ 7 mm Outer diameter:0.452 ''/ 11.5 mm height:0.689 ''/ 17.5 mm Hexagon width: 0.472 ''/ 12 mm Screw holes: M4 Please see the picture for other specific size. Package Included : 10 x 7mm length hexagon motor flexible coupling 20 x matching screws 2 x spanners 1 x Storage box Note: 1. To avoid causing an unnecessary mistake,pls check the size carefully before purchasing! 2. If you are not satisfied for any reason, just feel free to contact us, we would deal with it in a 24 hour time.