MODRATEC Useful Data (otherwise known as MUD) is a series of pages containing helpful information particularly relevant to rail modellers. The tables on this page use our easy-to-compare format to show drill diameters of standard size imperial, number, letter, and metric drill bits.

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Comparative Standard Drill Sizes

The tables below show the comparative size of standard drill bits.

• Imperial 1/64" to 1/2"
• Number 1 to 80
• Letter A to Z
• Metric 0.20mm to 12.70mm

Revised and extended 09-Nov-2003.

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