Parkside Multi-Angle Measuring Ruler

Four Interlocking Arms: The tool is made of four durable metal or plastic ruler bars that slide along integrated tracks. This allowing them to expand, contract, and pivot into countless variations.Dual-Unit Measurements: Each arm features engraved markings, providing precise increments in both centimeters/millimeters (ranging up to 25–28 cm depending on the side) and inches.Adjustable Locking Knobs: Four large metal tightening screws secure the overlapping tracks. When loosened, they allow free movement; when tightened, they rigidly freeze the arms into a concrete stencil.Center Slits: Every ruler arm has a hollow channel running down its center, allowing the connecting bolts to travel back and forth smoothly to alter the perimeter length of the shape.