Abstract: A portable cutter used for cutting different widths of thin sheet material. The portable cutter includes a right angle measurement bar with scale adapted for receipt against a front side of an open top storage box. The storage box is used for holding a large roll of thin sheet material therein. At least one cutting blade tool is adjustably mounted along a length of the measurement bar. The cutting blade tool includes a cutting blade disposed between a horizontal upper blade guide arm and a horizontal lower blade guide arm. Attached to a portion of the lower blade guide arm is a magnet holder with magnet used for releasable attachment to the measurement bar.