FAST AND ACCURATE THREAD SIZE VERIFICATION - This thread size checker keychain allows for quick and precise measurement, helping to eliminate guesswork and save time during projects. PORTABLE KEYCHAIN DESIGN - Easily attach this bolt size finder to your keys or belt loop for convenient access, making it a practical tool for professionals and DIY enthusiasts. CLEAR DUAL-UNIT MARKINGS - The bolt and nut identifier gauge includes both metric and imperial measurements with clearly engraved markings for easy and accurate size identification. STURDY, CORROSION-RESISTANT CONSTRUCTION - Made from high-quality materials, this thread checker is built to endure regular use and tough environments, offering durable performance. VERSATILE APPLICATION FOR ALL PROJECTS - Ideal for automotive, home improvement, or mechanical tasks, this thread gauge delivers reliable size verification for various bolt and nut types.