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, accurate, 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, 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 according to your needs. Accurate operation: 1mm. Flexible and easy to use. Let the scribe do what you want, meet all the carpenter's square wood scribing needs. A great gift for friends who love woodworking.