The Kupo 2-1/2″ grip head (also known as a gobo head), consists of a pair of rotating aluminum discs attached to a 5/8″ (16mm) receiver . The discs have four different sized V shaped jaws to accept any accessory witha 5/8″, 1/2″, 3/8″, or 1/4″ mounting stud or tubing. The V shaped jaws have teeth that grab whatever is mounted between the plates securely. The 2-1/2″ grip head features an oversized ergonomic T-handle and dedicated roller bearings designed for maximum torque. It uses a non-slip aluminum friction disc that will maintain its durability over time that offers the user positive locking strength and precise control. It is constructed around a solid steel central bolt with a fixed solid pin to secure it to the aluminum casting for increased strength and durability. The 2-1/2″ head is most often used in conjunction with a grip arm giving you complete flexibility to position gobos such as flags scrims and silks as well as other accessories virtually anywhere.