The grip head withhex stud is mounted to a hexagongal stud designed to fit the super convi clamp and super viser clamp systems. It is most often used in conjunction witha grip arm , giving you complete flexibility to position gobos such as flags, scrims and silks as well as other accessories virtually anywhere. This grip head has a black powder coated finish. It 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", 1/4" mounting stud or tubing.