4pcs 5mm to 5mm Plum Shaft Coupling Aluminium Flexible Coupling Coulper D20 L30 For CNC Part Specifications: - Structure: Jaw / Spider - Flexible or Rigid: Flexible - Model Number: Spider Shaft Coupling - Body Material: Aluminum Alloy - Sleeve Material: Polyurethane - Length: 30mm - Diameter: 20mm - Shaft usage: 5mm x 5mm