SOLID HARDENED STEEL CONSTRUCTION: This heavy duty ruler self tool is crafted from 5 mm thick high‑strength carbon manganese steel, quenched and reprocessed for exceptional toughness and stability. Its rugged build far outlasts ordinary metal rulers, resisting bending, warping, and daily wear in demanding environments. PORTABLE AND EASY TO STORE: The 0.2 inch thick manganese steel ruler comes with a protective case for safe storage and transport. Slim yet solid, it fits easily in a car glove box, tool bag, desk drawer, or backpack. Whether on job sites, during long road trips, or , you can quickly access it whenever it is DOUBLE SCALE FOR PRECISE MEASUREMENT: Featuring dual‑sided markings in inches and millimeters, this 20 inch and 50 cm metal straight edge offers clear, wear‑ graduations for long‑term accuracy. Ideal for construction layouts, workshop measurements, drafting, and DIY projects where precise, repeatable measurements matter. MULTIFUNCTIONAL SAFETY ESSENTIAL: Beyond a measuring tool, this heavy duty ruler can as an emergency striking device, such as for breaking vehicle in critical situations. A practical addition to car safety kits or home emergency gear, it conveniently combines everyday measurement with reliable emergency preparedness. WIDE APPLICATION & RELIABLE PERFORMANCE: Designed for durability and versatility, this heavy duty metal ruler suits professionals and DIYers alike. Use it as a straight edge for cutting, marking, and layout, or keep it on hand as part of your emergency response kit. Its compact, robust design ensures dependable performance in varied scenarios., Weight: 1.350000661357 pounds, Manufacturer: Ehwisbe