Includes a 4-150mm millimeter scale ruler for measuring bolt shank length with 1mm accuracy Combines size identification and length measurement, eliminating multiple readings and speeding up batch sorting tasks Quick identification of metric bolts / nut Simply insert bolt into matching slots for quick sizing, boosting hardware selection efficiency Easy storage in toolkits or pockets Ideal for on the go use in warehouses, equipment repairs, or projects requiring fast bolt verification Make of high strength ABS with engraved markings Maintain accuracy even in oily or humid workshop environments, available in black and red color option for long lasting Perfect for mechanical repairs, hardware inventory management, device assembly, and part organization Quickly sort screws by size to mixing, serving as a practical helper in toolkits, Manufacturer: Shurhome