Ball joint smooth-running and free of play. We produce the M3 ball joint bearing out of real constant plastic material with a small share in Teflon. Because of that there is only little attrition. The ball has got two laps as mounting surface (distance 7 mm). Bore diameter 3.2 mm. The chrome-plated ball is suitable for the mounting in our rudder arm or servo arm. With this combination there is a smooth-running transmission of power free of play constantly possible. You can use it in big flying models, jet models, big helicopter models and car models.