Precision Metric Screw & Bolt Gauge

Key Features

1. Comprehensive Sizing: Quickly identify common metric diameters including M2, M3, M4, M5, M6, and M8.
2. Integrated Length Rule: Features a built-in metric scale to accurately measure bolt lengths from the underside of the head to the tip.
3. Precision Thread Testing: Each hole is calibrated for a snug fit, ensuring you distinguish between similar sizes with total confidence.
4. High-Contrast Markings: Designed with easy-to-read, debossed numbering that won't fade or wear off like printed ink.
5. Compact & Durable: Lightweight yet rugged 3D-printed construction—perfect for tossing in a tool bag or mounting directly to your workbench.w