Item Type: Universal Joint Shaft Coupling_x005F_x000D_ Material: Steel_x005F_x000D_ Color: Silver_x005F_x000D_ Length: Approx. 17mm / 0.7in_x005F_x000D_ Diameter: Approx. 8mm / 0.3in_x005F_x000D_ Connection Hole Aperture: Approx. 2mm / 0.1in_x005F_x000D_ Application: RC Model Cars, Model Boats, Etc. 1HIGH 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. 2TWO SECTION DESIGN: Universal joint coupling connector is designed with two sections, flexible, drive large angle, easy to install and replace. 3SCOPE OF APPLICATION: Universal joint couplings are widely used for shaft connection and can be used in various model cars and model boats. 4ARBITRARY BENDING ANGLE: Universal joint couplers can be bent at any angle to meet your diversified needs, and can be used for motors, etc. 5PACKING LIST: 2mm universal joint shaft coupling package contains 5 mini coupling universal joints, 10 grub screws and 1 wrench.5 x_x005F_x000D_ _x005F_x000D_ UniversalJointShaftCoupling 1 x Wrench 10 x Grub Screw Please allow some error due to manual measurement.