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Printable 1:1 gauge

Drill bit gauge (metric)

Actual-size openings for common metric drill diameters. Verify the 50 mm square with a ruler after printing.

Back to drill bit checker

Calibration square (50 mm)

After printing, measure this square with a ruler. If it is not 50 mm, your printer scaled the page — reprint at 100% / Actual size.

50 mm verify with ruler

Gauge openings

Circles are drawn in real millimeters. Hold the object over the matching opening.

2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 8 10 ExactSize Tools · print at 100%
ExactSize Tools · Physical size reference only · Not a substitute for a calibrated metal gauge when precision is critical.