True Class 4 Material Pass-Through Mode – This patented accessory, available on ILS laser systems, provides the safety features necessary to convert the laser system into an open Class 4 laser device. This is accomplished by overriding the laser safety interlocks on the side doors of certain Universal laser systems, allowing the user to process continuous rolls of material or objects that are too large to fit entirely on the work surface. When operating an open laser system, extra safety features not normally required for fully enclosed laser systems must be present in order to legally and safely operate the laser system.