Features 1、45 STEEL: Flange coupling is made of 45 steel, heating and plating process makes it strong and insulated, impact shaft is more stable. 2、RC MODEL MOTOR PARTS: 4mm flange coupling connector is versatile and suitable for model shaft connection, perfect accessory for RC model motors. 3、SPECIAL DESIGN: Rigid flange coupling is a special design that holds a shaft on a flat surface and allows other parts to be easily installed on the shaft. 4、EASY TO INSTALL: Flange shaft coupling is perfect for replacing old or broken connectors and improving time efficiency, easy to install and replace. 5、SUFFICIENT QUANTITY: Flange coupling connector package contains a total of 5 rigid flange shaft couplings, a sufficient number to meet your needs. Item Type: Flange Coupling Connector Material: Steel Color: Silver Inner Diameter: Approx. 4mm/0.16in Diameter: Bottom: Approx. 22mm/0.87in, Cylinder: Approx. 10mm/0.39in Small Hole Diameter: Approx. 3mm/0.12in Application: Motor, Hardware, Mold, Mechanical Transmission of the Occasion Package List 5 x Flange Coupling Connector 1 x Wrench 10 x Grub Screw