Just limit ruler to the required size and the screw for easy use Small size, easy to store and carry Crafted from metal, smooth, rustproof, wear resistant and strong, not or deforms High working efficiency and accurate scale to ensures correct marking Quick and easy to draw straight lines with accurate without other cumbersome tool The metal locator is available in a variety of size, suitable for rulers of various widths, and holds ruler firmly and stable, Manufacturer: LiRRvb