The "Secret" Reverse Side Flip the tool over, and it transforms into a machinist's cheat sheet. The reverse side features a comprehensive Drill & Tap Gauge. This chart instantly tells you the correct drill bit size needed for tapping specific holes—eliminating the need to look up charts on your phone or in a handbook.

Shop-Ready Durability Molded from high-quality, impact-resistant plastic, this gauge is designed to be tossed in a toolbox, hung on a pegboard or tucked in a pocket for on-the-go access. It is chemically treated to resist water, alcohol, oil, and grease, ensuring the threading and text remain intact even in greasy shop environments.