Feature:1. Premium Steel: The RC flange coupling is made of premium 45 steel material, which is strong, durable and has long service life.2. 5mm Inner Diameter: The inner diameter of the RC flange coupling connector is 5mm, which is easy to install and replace.3. Electroplating Process: The heating and electroplating process makes the RC flange shaft coupler strong and insulating, and the impact shaft is more stable.4. Size: The diameter of the bottom of the flange coupling is 22mm, the diameter of the cylinder is 10mm, and the diameter of the small hole is 3mm.5. Wide Application: Wide range of the guide shaft coupler which is suitable for motors, hardware, molds, mechanical transmission scene.Specification:Item Type: RC Guide Shaft CouplerMaterial: SteelGross Weight: 50g/1.8ozColor: SilverInner Diameter: 5mm/0.20inDiameter: Bottom: 22mm/0.87in, cylinder: 10mm/0.39inSmall Hole Diameter: 3mm/0.12inApplicable: Motor, hardware, mold, mechanical transmission scene Package List:5 xRC Guide Shaft Coupler1 x Wrench 10 x Machine Screws