Rc Model Shaft Coupling Sleeves For Boats, Cars, Planes - Various Sizes. Enhance Your RC Models with Our Premium Metal Coupling, Crafted from Strong Brass for Outstanding Durability. Designed to Create Seamless Connections Between Optical Axes or Motors and Propeller Shafts, This Coupling is an Essential Addition for Model Ships and Various RC Toys. It Features M3 Side Screw Holes and Includes Four Screws with a Wrench for Straightforward Installation. Available in Multiple Sizes, You Can Choose the Perfect Fit for Your Project's Needs. --- Key Features: - Material: Durable Brass Construction for Longevity - Compatibility: Connects Optical Axes or Motors to Propeller Shafts - Universal Fit: Includes M3 Side Screw Holes and Screws - Multiple Sizes: Customizable for a Variety of Applications - Package Includes: 1 Brass Coupling, 4 Screws, 1 Wrench Product Dimensions: - End Diameter: 9mm - Intermediate Diameter: 7mm - Total Length: Approximately 20mm Available Sizes: - 2mm Options: 2mm to 2mm, 2.3mm, 3mm, 3.17mm, 4mm, 5mm, 6mm - 2.3mm Options: 2.3mm to 2.3mm, 3mm, 4mm - 3mm Options: 3mm to 3mm, 3.17mm, 4mm, 5mm, 6mm - 3.17mm Options: 3.17mm to 3.17mm, 4mm, 5mm - 4mm Options: 4mm to 4mm, 5mm, 6mm - 5mm Options: 5mm to 5mm, 6mm - 6mm Option: 6mm to 6mm Ensure Precise Performance and Versatility for Your RC Projects with This Reliable Brass Coupling..