Bolt Head and Nut Size Catcher, Gauge SAE 5/16inch – 1inch and Metric 8mm – 25mm, Portable Multifunctional Keychain Fastener Measurement Tool for Automotive Repair, Engineers, and DIY

Measure the Size: The SAE specification is 5/16 inches to 1 inch, and the metric specification is 8 millimeters to 25 millimeters. Double scale marking ensures accurate measurement of bolt and nut head dimensions for any project.
Portable: This product is compact, exquisite, and lightweight, and can be carried in a pocket or clipped onto a keychain. It is an ideal choice for mechanical processing, car repair, and home maintenance.
Durable: This thread measuring instrument is made of high-quality aluminum alloy, which is durable and can withstand harsh conditions and frequent use without rust or wear.
Improve Efficiency: This product has adjustable openings and clear and easy to read scale markings that can quickly locate nut and bolt sizes, reducing measurement time and suitable for users who need to measure fasteners frequently.
Applications: This product is very suitable for measuring fasteners in automotive, construction, and home projects, and is a must-have tool for DIY enthusiasts and professionals.