* Made of high quality aluminium alloy, this protractor is superior and stronger than traditional plastic ruler angle divider. it is resistant to scratch and very durable. * Place the protractor on the work area, slide the ruler into the desired shape, and tighten the screws. There, you can make perfect measurements and now you can transfer and track them to any material. * The multi-angle gauge slides and locks to any desired angle, saving time for repeated measurements. The four-sided ruler can be a reusable template for endless applications. * There's no need to create a new template for each new job, and you don't need to re-measure the same angle over and over again - the measurement protractor saves you time and effort! * Multiple applications: perfect for brick, tile, wood, stone, laminate and any other material! * Using laser engraving technology, the angle degree is directly engraved onto the aluminum alloy ruler, which will not be worn out easily. foldable for easy storage and feature a one-handed operation with a unique tightening mechanism.