4pcs 6x8mm D20 L25 Shaft Coupling Aluminium Plum Flexible Motor Conector Flexible Couple 6mm to 8mmSpecifications:- Structure: Jaw / Spider- Flexible or Rigid: Flexible- Model Number: Spider Shaft Coupling- Body Material: Aluminum Alloy- Sleeve Material: Polyurethane- Length: 25mm- Diameter: 20mm- Shaft usage: 6mm x 8mm