Features: Engineered with high precisions alloy construction, this positioning block ensures long lasting durability and accurate measurements for professional tasks. Features a clear, easy to read surfaces scale and robust design, ideal for repetitive use in demanding environments where measurement consistency is critical. Tailored for engineers, carpenter, enthusiasts, and precisions focused professional requiring dimensional accuracy in woodworking, metalworking, or laboratory applications. Optimized for industrial manufacturing setups, detailed carpentry projects, and scientific research labs where alignment and measurement precisions are important. Combines lightweight portability with industrial strength performances, making it a indispensable calibration tool for workshops, construction sites, and technical prototyping environments. Specifications: Component: Alloy Size: 20MM: size 30x20x8mm, suitable for ruler width 18-20mm, ruler thickness <1mm 26MM: size 40x20x8mm, suitable for ruler width 24-26mm, ruler thickness <1.5mm 29MM: size 42x20x8mm, suitable for ruler width 27-29mm, ruler thickness <1.5mm Package Includes: 1pc Positioning Block note: Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color.