Laser-cutter

Laser-Cutters are tools used by the Covenant to cut materials. They utilize high-power lasers that can cut almost anything.

The Kig-Yar aboard the Minor Transgression use laser-cutters to disconnect the Luminary from the ship's main power grid, which was heresy.

As (almost) demonstrated by Zhar, a laser-cutter can be used as a deadly weapon if the need arises. As the Arbiter in the mission "Gas Mine" there is an easter egg where you can see a laser cutter.