The Zacuto Z-TM T-Mount is a t-shaped 15 mm perpendicular rod mount. It includes one 15 mm rod port that is secured by an Allen screw and one 15 mm quick release hole, which sits perpendicular to the port. You can attach any 15 mm rod accessory to this, such as one of the articulating arms or a ZUD. It is most commonly used to attach an FS100 microphone to the FS100 Top Handle. The rod port attaches to the Top Handle rod and allows you to slide your microphone mount into the 15 mm hole. It can also be mounted onto any 15 mm rod end.