Color: As shown in the First image. Quantity and size : As shown in the title or description. Universal Metal Joint Coupling, Screw And Spanner Features: Material: STEEL Standard or Nonstandard: Standard Flexible or Rigid: Rigid Metal Joint Suited to Use Direct Axis Motor, compatible with Model Cars, Model Ships, Robots, and Other Metal Adapter to Use Size Features:: "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: M3 3mm-5mm, 3.17mm-5mm, 4mm-5mm, 4mm-6mm, 5mm-5mm, 5mm-6mm, 6mm-6mm Universal Joint Outside Diameter: 11mm Universal Joint Length: 23mm Side Screw Fixing Hole: M4 5mm-8mm, 6mm-8mm, 6.35mm-8mm, 8mm-8mm Universal Joint Outside Diameter: 14mm Universal Joint Length: 35mm Side Screw Fixing Hole: M4 Fixed Clamp Spring Design 8mm-10mm, 10mm-10mm Universal Joint Outside Diameter: 16mm Universal Joint Length: 35mm Side Screw Fixing Hole: M4 Package Included: Universal Joint X 1 Screw X 2 Spanner X 1