[ Construction]Constructed from high-quality aluminum alloy, this ruler is wear-, rust-proof, and exceptionally , making it an indispensable tool for architectural drawing, carpentry, and other professional applications. [ Marking]Equipped with engraved lines at 1mm intervals on the outer edges and 1.3mm holes every 1mm on the blade, this ruler allows for precise marking by inserting a pencil and sliding along the workpiece, ensuring accuracy along the stock edge. [Ergonomic Design]Featuring clear and readable inch or metric scales suitable for any lighting condition, and a 45-degree beveled blade minimize parallax, enhancing both measuring and marking for all users, including the elderly. [Optimal Pencil Compatibility]Designed for use with 0.7mm and 0.9mm mechanical pencils, this ruler offers a balance of and durability, avoiding the breakage common with 0.5mm leads and providing a superior alternative to wooden pencils., Weight: 185.0 pounds, Manufacturer: IJSDNVJNDX