Ever found a bolt or nut and wondered what size it is? This simple plastic bolt gauge tool takes the guesswork out! It's a yellow plastic card with cutouts and markings that let you quickly identify both standard (SAE) and metric bolt sizes, nut sizes, and even includes a ruler for small measurements. Just match your hardware to the holes and slots - if it fits perfectly, you've found your size! Brand new and unbranded, this is one of those handy tools that lives in your toolbox or workshop drawer and gets used more often than you'd think. Great for DIYers, mechanics, or anyone who deals with mixed hardware. No batteries, no complicated instructions - just a straightforward physical gauge. It's made of durable plastic (with California Prop 65 warning about plastic materials) and has a bright yellow color that's easy to spot among your tools. Whether you're organizing hardware, buying replacements, or just trying to figure out what you're working with, this bolt card saves time and prevents mistakes. Much easier than digging through multiple wrenches or calipers for simple size identification. A small investment that pays off in convenience!