Completely gear driven design for slip-free and accurate movement == Adjustable locking system * Gear drive can be mounted from either side (works for both right-handed and left-handed) == Mounts onto 15mm Rod Support (60mm center to center difference) * Compatible with all DSLR cameras, video cameras == Compatible with industry standard 15mm rods * Presents the most innovative and needed function of Movable Focus Indicator == Easy begin / end setup for accurate and highly repeatable racking between your desired indicator location * Gears nylon and ABS, Dial Index Adjustment : 360° == Fit Rail Diameter : 15 mm == Fit Rail Distance : 60 mm == Gear MOD: industry standard 0.8