Features: Accurate engineered stainless steel ruler with double hole design ensures accurate measurements under 0.5mm error, perfect for engineers and designers requiring reliable calibration tool. Crafted from corrosion resistant stainless steel, this 2mm thick ruler features round and square holes for multifunctional marking, hanging, or securing in professional workflows. Ideal for marine engineers, architects, and laboratory technicians who demand sturdy, rusts proof measuring instrument in humid or demanding environment. Optimized for construction sites, academic laboratory, and fieldwork with its lightweight 150g design, effortlessly replacing bulky traditional rulers in mobiles workspaces. Combines industrial grades durability with portability, maintaining measurement integrity across decade of use while fitting seamlessly into toolkit for professional. Specifications: Material: Stainless Steel Total Length:Approx. 310mm/12.2inches Type:Round Hole/Square Hole(Optional) Package Includes: 1Pc Stainless Steel accurate Ruler note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.