Features:
Exact follow focus design helps to adjust focus.
Damping design, good touch feeling.
Convenient for assembling and disassembling.
Easy to be upgraded.
Follow focus is made of high strength aluminum alloy.
Gear drive can be mounted on both sides (works for both right-handed and left-handed).
With a focus ring, it fits lens size from 52mm to 86mm.
International standard, mounts on 15mm rod support (rail center to center: 60mm).

Specifications:
Compatibility: All (D)SLR cameras and camcorders
Material: Aluminum alloy + PC + ABS
Fit lens size: 52-86mm / 2.0-3.4in
Fit rail distance: 60mm / 23.6in
Fit rail diameter: 15mm / 0.6in
Weight: 341g / 12.0oz
Package size: 18 * 9.3 * 9.3cm / 7.1 * 3.7 * 3.7in
Package weight: 400g / 14.1oz

Package list:
1 * Follow focus
1 * Focus ring