With good oxidation resistance: Using aluminum alloy material with good oxidation resistance, wear-resistant and rust-proof. Can be freely extended: can be freely extended for a variety of angle measurements, and can be changed at any time, How to use: place the tool on the work area, slide the ruler into the desired shape and tighten the screws, you can make a perfect measurement, then transmit and track any material. Save time and effort: The multi-angle gauge can be slid and locked at any desired angle, saving time and effort for repeated measurements. Four-sided ruler: The four-sided ruler can be slid and locked at any angle as a reusable template that can be used for endless applications.Note: The data is all manual measurement, s Please allow 1-3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.