Item Type: Universal Joint Coupling Connector Material: Steel Color: Silver Size: Length: Approx. 57mm/2.24in Diameter: Approx. 16mm/0.63in Connection Hole Diameter: Approx. 10-10mm/0.39-0.39in Aperture of Side Hole: Approx. 4mm/0.16in Applicable: RC Model Cars, Model Boats, etc.1Premium Material: Universal joint coupling connector is made of 45# steel, which is durable, corrosion resistant and has a long service life. 2Fine Crafted: The universal joint coupling connector adopts heating and electroplating processes to make it strong and insulated, and the impact shaft is more stable. 3Superior Performance: Three sections mini coupling universal joint, used to connect two shafts, and can be bent at any angle, the transmission angle is large. 4Widely Used: Universal joint coupling connector can be used in various model cars and model ships. Easy to install and replace. 5Package Includes: The package contains 3 x mini coupling universal joint,12 x set screws and 1 x wrench. 3 xUniversalJointCouplingConnector 12 x Set Screw 1 x Wrench