The 2-1/2" Grip Head, KG203012 consists of a pair of rotating aluminum discs attached to a 5/8" (16 mm) receiver. The discs have four different sized "V" shaped jaws to accept any accessory with a 5/8", 1/2", 3/8", 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. The KG203012 uses a non-slip aluminum friction disc that will maintain its durability over time that offers the user positive locking strength and precise control. The KG203012 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-- "go betweens"-- such as flags, scrims and silks as well as other accessories virtually anywhere.