Fotga DP3000 M3 Quick Release Follow Focus for Matte Box 15mm Rail Rod Rig Nikon Canon Sony Dslr Cameras Quick-Release Version, easily attached and detach,Material: Aluminum Alloy, Plastic There is an improvement on its inner structure to reach a high level in this field, the Dampened gear box, which permits much less backlash(even zero backlash),even better than most follow focus on the market The gear wheel on it can be detached and installed in both sides,which makes it suitable for both left-hand and right-hand photographer. The connection mount to the gear wheel is not only the newest version but also the last upgrade version The white mark ring is made of magnet material. It can be detached or attached easily and quickly from the follow focus. You can also buy additional mark ring.There is a release button on the side which can easily locate the focus This set comes with a free flexible gear belt can be used with any zoom or prime lenses with a wide range of lens diameters(any size from 46 to 110mm) Specifications: Material: Plastic. Improved design has dampening which gives virtually zero backlash(&lt;0.5mm). Long-life precision engineered gearbox enables accurate and reliable focusing Compatible with industry standard Follow Focus Whip or Crank. Gear drive can be mounted from both side.(Works for both right-handed and left handed) This set comes with a free flexible gear belt can be used with any zoom or prime lenses with a wide range of lens diameters(any size from 46 to 110mm) Adjustable locking systems Mounts onto 15 mm Rod Support (60mm center to center distance). MOD Drive Gear: Industry standard 0.8. Can work with different size gear to meet you need with different lens. Compatible with industry stand 15mm rods Rail distance: 60mm Rail diameter: 15mm Net weight: 232g Package including: 1 x Fotga DP3000 Quick-Release Clamp Dampen Follow focus (M3) 1 x 0.8mm matching gear belt (adjustable for 46mm-110mm) 1 x43T Gear