| Universal Metal Joint Coupling, Screw And Spanner. Specifications: Material: STEEL Standard or Nonstandard: Standard Flexible or Rigid: Rigid Metal Joint Suited to Use Direct Axis Motor, Suitable for Model Cars, Model Ships, Robots, and Other Metal Adapter to Use. Size Specification: "4mm-6mm" Means "one Hole Diameter of the Coupler is 4mm ,the Other is 6mm" 2mm-2mm, 2mm-2.3mm, 2.3mm-2.3mm Universal Joint Outside Diameter: 8mm Universal Joint Length: 18mm Side Screw Fixing Hole: M3 2mm-3mm, 2mm-4mm, 2.3mm-3mm, 2.3mm-4mm, 3mm-3mm, 3mm-3.17mm, 3mm-4mm, 3.17mm-3.17mm, 3.17mm-4mm, 4mm-4mm Universal Joint Outside Diameter: 9mm Universal Joint Length: 23mm Side Screw Fixing Hole… | |