Number drill bit #22.A #22 drill bit is 0.157 inches (3.988 mm) in diameter, a common size in the American number gauge system, often used for tapping smaller threads or for clearance holes where you need a precise fractional equivalent like just under 5/32nds of an inch. Key Measurements: Inches: 0.157" Millimeters: 3.988 mm (or ~3.99 mm)
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