Indoor hinge with servo arm integraded. It's made in high strength nylon. The rudder blade has cultivated a well-defined pivot point so that the positioning accuracy of the servos is also transferred. The hinges allow + / - 60 degrees angle adjustment. The distance rudder arm - pivot point is 20mm on both sides. The included servo arms can be screwed onto the original lever with, but need to be secured with small pieces of shrink tubing. A cpl. Rudder hinge weighs only 0.5 grams!!