The Zacuto Z-TRIM Tri-Mount expands upon the standard T-Mount by adding on a third 15 mm hole. The Tri-Mount is a T-shaped 15 mm rod mount. It includes one 15 mm rod port that is secured by an Allen screw and two 15 mm quick release holes, which sit perpendicular to the port. The mount is ideal for use with the FS100 Top Handle. It gives you two extra mounting holes on the handle, allowing you to mount your FS100 microphone and an additional accessory such as EVF, a light, arm, recorder, etc.