This adapter head features a built-in 3/8″ bushing that can be pushed down to reveal a 1/4″-20 mount. The 3/8″ mount will allow you to attach your own tripod head to use on the MegaMast, while the 1/4″-20 mount will fit the Studio Assets Motorized Pan/Tilt Head as well as the Bescor MP101 motorized pan/tilt head.