【EASY TO USE AND STORE】The metal straight edge of precision metal ruler with safe grinded edges, end sides are smooth with no burr. One end is square, the other is rounded with a hole to make it easy for hanging, convenient storage. 【3 DIFFERENT MEASUREMENT RANGE RULER】 15cm, 20cm and 30cm suitable for different measuring jobs.Often Used by Carpenters , Dry wallers, Architects, Students, Teachers, at the Office, DIYers, and More! 【INDUSTRIAL GRADE STAINLESS STEEL RULER】100% Stainless Steel to Prevent Rust & Corrosion. Office ruler is made of durable 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 time. 【CONVERSION TABLE FOR QUICK CALCULATE】 There is a conversion table on the back to help you calculate the measurements in other units; Measurement markings begin at the edge of the rule, convenient to use. 【GRINDING & POLISHING & THICKER SIDE 】 More grinding and polishing process than other suppliers to ensure the inside edges is not sharp, much more safety to you and your kids.The surface of the rulers are smooth with no burr; One end is square, the other is rounded with a hole to make it easy for hanging., Weight: 0.220462262 pounds, Manufacturer: Dapetz