Feature: 1. HIGH STRENGTH: Universal joint shaft coupling is made of steel, which is strong, wear resistant, durable, not easy to damage, and has a long service life. 2. TWO SECTION DESIGN: Universal joint coupling connector is designed with two sections, flexible, drive large angle, easy to install and replace. 3. SCOPE OF APPLICATION: Universal joint couplings are widely used for shaft connection and can be used in various model cars and model boats. 4. ARBITRARY BENDING ANGLE: Universal joint couplers can be bent at any angle to meet your diversified needs, and can be used for motors, etc. 5. PACKING LIST: 2mm universal joint shaft coupling package contains 5 mini coupling universal joints, 10 grub screws and 1 wrench. Specification: Item Type: Universal Joint Shaft Coupling Material: Steel Color: Silver Length: Approx. 17mm / 0.7in Diameter: Approx. 8mm / 0.3in Connection Hole Aperture: Approx. 2mm / 0.1in Application: RC Model Cars, Model Boats, Etc.. Package List: 5 x Universal Joint Shaft Coupling1 x Wrench10 x Grub Screw Note: Please allow some error due to manual measurement.