Feature 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.SpecificationItem Type: Universal Joint Shaft CouplingMaterial: SteelColor: SilverLength: Approx. 17mm / 0.7inDiameter: Approx. 8mm / 0.3inConnection Hole Aperture: Approx. 2mm / 0.1inApplication: RC Model Cars, Model Boats, Etc. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List5 x UniversalJointShaftCoupling1 x Wrench10 x Grub ScrewNotePlease allow some error due to manual measurement.