The ART Positioner 2 is considered the best mechanical lanyard adjuster on the market. A unique feature is its ability to shorten and lengthen your lanyard under load, and you can do this using one hand! No more jolts or jerks thanks to the ART Positioners lock jack cam system. The carabiner attachment point is on a swivel which compensates for inevitable rope twists and keeps the ART Positioner in the correct position (no need to add a swivel to the system. The ART Positioner 2 is designed to run on 11-13 mm lines. All parts are replaceable.