The Norbert Iris Rod Clamp with 8" Standard 15mm Rods from K-Tek is the same assembly that comes with the Norbert Filmmaker Kit. The included 8 inch (20.3 cm) rods are made of lightweight carbon fiber and they support lens accessories such as follow focus devices and matte boxes. The Iris Rod Clamp accepts any pair of standard 15mm rods. With its top screw threads, the clamp mounts to the bottom of a camera plate or an accessory frame. Its bottom screw threads allow the assembly to mount to a tripod head.