This drill bit size chart primarily serves as a reference guide to help you select the correct drill bit size for a specific task. It provides a correlation between various measurement systems and the corresponding drill bit sizes. This ensures that the right bit is chosen for a particular application, preventing damage to the workpiece and the drill bit itself, specifically for:

Bestdrill bit that goes through steel

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CobaltDrillbits

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Bestdrill bitfor metal

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Here is a comprehensive list of factors to consider and questions to ask when making this important decision for your business.

Engineered for controlled precision and speed, IRWIN® Metal Drill Bits are available in jobber and mechanics lengths with general purpose 118° Conventional Point and self-centering 135° Split Point or TURBOMAX® Tip for drilling sheet metal, mild steel, high alloy steel, stainless steel, cast iron, aluminum, brass & copper, and plastic.

You may want to consider getting the Engineers Black Book (3rd Edition – Metric) for more complete information, specifically:

CarbideDrillbits

In essence, gauge sizing is a way to define the diameter of a drill bit, allowing for accurate selection and use in various applications.

For your convenience, here is a simplified chart of which spanner you should use for what size of bolt or nut you need to turn, including a cross-reference table of common and alternative metric and imperial (UNC/UNF) values.