The T-Mount is a t-shaped 15mm perpendicular rod mount. It includes (1) 15mm rod port that is secured by an Allen screw and (1) 15mm quick release hole which sits perpendicular to the port. You can attach any 15mm rod accessory to this, such as one of our articulating arms or a Zud. It is most commonly used to attach an FS100 microphone to our FS100 Top Handle. The rod port attaches to the Top Handle rod and allows you to slide your microphone mount into the 15mm hole. It can also be mounted onto any 15mm rod end.