Chrosziel's DV StudioRig Follow Focus Kit is a follow focus kit and comes with a scale for one-side-operation and is for lenses with 110mm diameter (measured with gear drive not included).
Precise gears with practically no play at a very affordable price. A single lock for rod and extension clamp makes changing of lenses quick. Hand wheel with fine-structured surface for save grip. The scale is easy to change and the reference marking is adjustable for the operator or the assistant. Gear drives and gear rings for the different lenses ensure precise adjustments and can be mounted without tool on both sides of the gear unit.
The VariLock 2 feature of the Rigs now allows both since the range of rotation is fully variable for any selectable limit. The red stopper marks infinity or any other distance and the blue one the second focal plane or the nearest lens setting. By unlocking the two variable end stops the hand wheel turns unlimited.