Fotga Flexible Gear Belt Ring for DP500 DP5002S DP500III JTZ DP30 Follow Focus FF Adjustable from 46mm to 110mm (Black) Material: Rubber Gear Belt,Easy to make adjustment,fast locking Flexible Follow Focus Gear Ring Belt fits any lens with diameter from 46 to 110mm Suitable for all DSLR Cameras,video cameras,DV,HDV,HDSLR. With Screw lock Gear module: Film industry standard 0.8 Packing included:1 * Gear belt