Neewer Follow Focus with Single 15mm Rod Clamp,Adjustbale Gear Ring Belt for DSLR Cameras/DV/Camcorder/Film/Video Cameras,Fits Shoulder Supports,Stabilizers,Movie rigs Use gear drive to adjust camera focus in a more accurate and smooth way. Easy to install and use. Follow Focus comes mounts with a single 15mm Quick Release Rod Clamp and can be quickly removed from the rail system, making it easier to change lenses and gear positions. Grooved knob for slip-free control. It can be mounted from both sides for left-handed or right-handed photographers. Compitable with all DSLR cameras,camcorders.film cameras and video cameras.It can fit industry standard 15mm/0.59" rod.(ROD NOT INCLUDED)