OLFA XL2 Long Reach Retractable 18mm Blade Knife.
This knife is fitted with a locking thumbscrew to enable the exposed cutting edge of the blade to be set at varying lengths.
It’s design originated from the requirement of a long knife for hard to reach places.
It is used today throughout the world within the automotive windscreen / windshield removal / replacement industry for cutting the urethane beads used to hold automotive glass in place.
If the knife is required for an application where the blade is to be set at a long extension or fully extended then the use of a non-segmented blades is highly recommended to avoid blade breakage.
These are available as a heavy duty (0.5mm thickness) blade specifically for this use.