Comfylichi 66 Thread Checker with Toolbox, 66-Piece SAE and Metric Gauge Set

When a repair calls for identifying a nut or bolt thread, a clear size match helps you choose the right fastener for the job. The Comfylichi 66 Thread Checker with Toolbox includes 34 SAE and 32 metric gauges, with detachable pieces that make it easier to check threads in narrow gaps, around pipes, and on machinery.

For quick checks at a crowded workbench or in a tight spot, the individual gauges offer a more flexible approach than a fixed board-style checker.

The essentials

Each gauge checks a specific thread size: screw the fastener onto the matching gauge to identify its size. The set covers SAE and metric threads, making it useful for workshop repairs, mechanical work, and DIY projects where fasteners may use either system. Its aluminum construction keeps the gauges in a compact, detachable format that can be handled individually instead of maneuvering a larger checker into position.

Size identification is designed to be easy to read in different ways. Markings are laser-engraved on the gauge bodies, with the sizes also shown on the reference chart and foam insert. Red identifies metric gauges and blue identifies SAE, so the two systems are easy to distinguish while sorting fasteners or working in a dim workspace. The set is described as meeting ANSI 2B Go/No-Go standards.

Customers often praise the legible size display and the usefulness of the gauges for automotive projects and lathe work. Feedback about the build is mixed: some appreciate the aluminum gauges, while others raise concerns about the case and long-term durability, including reports of rust. The dedicated foam slots keep each piece organized between tasks.

Getting the most from it

Choose the SAE or metric gauge that matches the fastener you are checking, then thread the nut or bolt onto it to find the corresponding size. Keeping the pieces in their labeled foam slots helps make the next check straightforward and reduces rummaging through a general toolbox. The detachable design is particularly practical when access is restricted and a full-size board is awkward to position.

Practical tips

Use the color coding as a quick first step: red for metric and blue for SAE. Read the engraved marking on the gauge, then refer to the included chart or the markings on the foam insert if you want another way to confirm the size. After checking a fastener, return the gauge to its dedicated slot so the set stays organized for the next repair. This routine suits both occasional home projects and repeated workshop checks, including jobs where fasteners need to be identified before replacing or sorting them.

Final verdict

The Comfylichi set is a practical fit for anyone who regularly sorts or replaces threaded fasteners and wants both SAE and metric gauges in one organized kit. Its 66 detachable aluminum gauges, three marking locations, color coding, and individual foam slots support quick identification at a bench or in confined spaces. Choose it for hands-on workshop, automotive, mechanical, or DIY tasks where a clear thread-size check helps guide the next step.