engraving , concave scale design , with metric on side and on the other end Suitable for any environment , can maintain accuracy for a long for time Ruler is 0.7mm Thicker A+ stainless steel non-bendable but a little flexible , good for long lasting use The markings are recessed a bit into the metal , so they will not rub off over for time This straight ruler is a useful measuring tool for artists , designers , architects , engineers , and students Surface of the rulers are smooth with no burr , with a hole to make it easy for hanging , storage.Which keep your things organized, Manufacturer: Watreketal