Amazon.com: Standard to Metric Conversion Chart Magnet by Magnet America is 10.75" x 3.5" Made for Refrigerators Or Any Magnetic Receptive Materials : Industrial & Scientific
Wrench Spanners - Inches vs. mm
Amazon.com: Easy to Read Fraction and Decimal to Metric Conversion Chart Inches and Millimeters. 1 Sided. (Flexible Polyester Card, 5.5"x8.5") : Industrial & Scientific
Inches to mm Conversion (Inches To Millimeters) - Inch Calculator
A Gauge to MM plug conversion chart that doesn't skip sizes : r/piercing