A simple ruler made of solid brass. With 45 tons of power, the brass plate is pulled out, trimmed, bent, trimmed again, and laser engraved to create a ruler. Draw a straight line and measure accurately. One side is slightly raised so that it can be easily picked up and drawn easily with an ink pen. Although use from beginning has a golden luster, over time it will become a deeply dull hue and will continue to change in appearance, like other antique tools.