2X Brass Rigid Motor Shaft Coupling Coupler Transmission Connector Sleeve Adapter 3.17/4/5/6/8/10/12mm For RC Boat Car Airplane

High-concerned chemical：None Standard or Nonstandard：Standard Flexible or Rigid：Rigid Model Number：3.17/4/5/6/8/10/12mm Material：Brass Structure：Cylindrical coupling Origin：Mainland China Certification：NONE

High-concerned chemical: None Standard or Nonstandard: Standard Flexible or Rigid: Rigid Model Number: 3.17/4/5/6/8/10/12mm Material: Brass Structure: Cylindrical coupling Origin: Mainland China Certification: NONE