Quickly and easily draw straight lines with accurate measurements without other cumbersome tools The metal holder available in different sizes, is suitable for rulers of different widths and holds ruler firmly and stably Easy to store and transport. Made of metal, smooth, rust-proof, wear-resistant and stable, does not tear or deform Simply limit ruler to the required size and lock the screw for easy use High working efficiency and accurate scale for correct marking, Manufacturer: OSNIYAW