Quality Assurance ----- The ruler body is made of solid 6061 aluminum alloy, and the rotary knob is made of 100% pure high-quality brass. Comfortable texture. All scales on the ruler are laser-engraved, precise, clear, and easy to read. Scribing Function ----- Use the small hole as a starting point, adjust the length you need, hold the ruler in your left hand, and draw lines with your right hand as needed. Measuring Function ----- Move the limit block to the top of the ruler and tighten the knob. The ruler turns into a T-ruler for daily measurement. Perfect Design ----- Bilateral scale, you can use the scales on both sides of the ruler as needed. Accurate operation: 1 mm. Flexible and easy to use. Let the scribe do what you want, meet all the woodworker's square wood scribing needs. A great gift for friends who love woodworking.