Pro Precise design, with **AB Stop**, allows user to control the focus distance of FF. * With ***Quick Release Clamp***, allow user to mount and release the FF quickly. * Allow user to control the TIGHTNESS of the follow focus. * Material: completely metal. (Gear part is of brass and steel,other part is of aluminum). Gear drive can be mounted from both side.(Works for both right-handed and left handed) * Includes flexible gearbelt can be used with any zoom or prime lenses with a wide range of lens diameters(any size from 46 to 110mm)