Brand DEBAO Quantity 1 piece(s) per pack Color Black + red + blue Material Aluminum alloy Diameter No Compatible Camera Models Universal Functions Control the focal length of lens Other Features Precise engineered gearbox enables accurate and reliable focusing; Quick and easy installation; Greatly facilitate the cameraman fast and accurate focus making the film shooting more perfect and efficient; Quickly locate the driver of recovery coke swivels around placed suitable for both right-hand and left-hand; Compatible with industry standard 15mm rods Packing List 1 x Follow Focus 2 x Rings