Made of high quality brass, wear-resistant, not easy to rust, long service life. With 300mm steel ruler with double scale, easy to use. Made of alloy machined aluminum with multi-axis precision equipment, sandblasted and anodized. The woodworking line finder is suitable for a variety of steel rulers, not easy to slip. Easy to draw the line in parallel. The carpenter scriber is easy and convenient to carry or store when not in use. This ruler positioning block is suitable for both carpenters and home users for a variety of applications.