Features: Engineer steel Screw Measuring gauges delivers ±0.01mm accuracy for error without fastener sizing in mechanical and construction projects. strong steel construction resists deformation and corrosion, outperforming plastic rulers by 200% life in humid/ environment . Ideal for engineers, lab technicians, and DIY enthusiasts requiring reliable dimensional verification during equipment assembly or development. small design for toolbelts effortlessly, become the go measurement solution for fieldwork, workshop repairs, and accuracy machining applications. Professional thickness combines portability with workshop durability, maintaining calibration accuracy through rigorous daily use across industry . Specifications: Material: steel Size: about 5.7x10cm/2.24x3.97inch Package Includes: 2xScrew Measurement Tool note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.