Features 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. Item Type: RC Guide Shaft Coupler Material: Steel Gross Weight: 50g/1.8oz Color: Silver Inner Diameter: 5mm/0.20in Diameter: Bottom: 22mm/0.87in, cylinder: 10mm/0.39in Small Hole Diameter: 3mm/0.12in Applicable: Motor, hardware, mold, mechanical transmission scene Package List 5 x RC Guide Shaft Coupler 1 x Wrench 10 x Machine Screws