Metric Conversion
| Gauge | Millimeters | Length / Diameter | Millimeters | |
| 20g | 0.8mm | 5/16” | 8mm | |
| 18g | 1.0mm | 3/8” | 10mm | |
| 16g | 1.2mm | 7/16” | 11mm | |
| 14g | 1.6mm | 1/2” | 12mm | |
| 12g | 2.0mm | 9/16” | 14mm | |
| 10g | 2.4mm | 5/8” | 16mm | |
| 8g | 3.2mm | 3/4” | 19mm | |
| 6g | 4mm | 7/8” | 22mm | |
| 4g | 5mm | 1” | 25mm | |
| 2g | 6mm | 1 1/8” | 29mm | |
| 0g | 8mm | 1 1/4” | 32mm | |
| 00g | 10mm | 1 3/8” | 35mm | |
| 1/2" | 12.5mm | 1 1/2” | 38mm | |
| 9/16" | 14mm | 1 5/8” | 41mm | |
| 5/8" | 16mm | 1 3/4” | 44mm | |
| 3/4" | 19mm | 1 7/8” | 48mm | |
| 7/8" | 22mm | 2” | 51mm | |
| 1" | 25mm | |||
| 1 1/4" | 32mm | |||
| 1 3/8" | 35mm | |||
| 1 1/2" | 38mm | |||
| 1 3/4" | 44mm | |||
| 2" | 51mm |