Wikia

4-DOF robot arm was a style of robotic arm designed and produced by Cybot Galactica, commonly used on the WED-15 Septoid Treadwell droids. It consisted of two tubing segments connected with servos and hydraulics, and was equipped with a universal mount, which allowed to attach it to any given type of robotic hand or tool. Standard WED Treadwell droids were mounted with four of those arms.