Number drill bit #8. Used in knife-making projects. NOTE: this is NOT the same size as the 8 mm drill bits used for pen-making. A #8 drill bit is approximately 0.199 inches (5.05 mm), often used as a pilot hole for #8 screws, though the exact fractional size can vary slightly depending on if you're drilling hard/soft wood (around 1/8" or 3/32") or using it with machine screws like an 8-32 (which uses a #29 bit for a snug fit). A #8 bit measures 0.199 inches (5.05 mm) in diameter.
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