TARION TR-FF1 Follow Focus Finder Support 15mm Rod with Handle for Cameras DSLR Rig Made of T661 aluminum, CNC milling. Gear drive can be mounted from either side (works for both right-handed and left-handed). Equipped with a gear belt for lenses of diameter 50-100mm. Compatible with LWS 15mm rail accessory (Not Included). Gear Mod: 0.8. The equipped handle can make your shoots precisely, focus precisely and operate smoothly.