The surface of the ruler is smooth without burrs and has holes for easy hanging and storage. Keep things organized Engraved, concave scale design with metric on side and other end. Suitable for all environments and maintain accuracy for a long time This straight ruler is a useful measuring tool for artists, designers, architects, engineers and students The markings are slightly recessed in the metal so they will not fade over time The ruler is 0.7mm thick A+ stainless steel which will not bend, but a little flexible for long term use, Manufacturer: LEMEIGUO