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Gauge Chart
Gauge refers to the inside diameter of the hole in the end of the barrel key.
| Gauge | Inches | Millimeters |
| 11 | .117" | 3.00 mm |
| 10 | .128" | 3.24 mm |
| 9 | .145" | 3.66 mm |
| 8 | .160" | 4.04 mm |
| 7 | .178" | 4.46 mm |
| 6 | .193" | 4.90 mm |
| 5 | .212" | 5.38 mm |
| 4 | .234 | 5.89 mm |
| 3 | .245" | 6.34 mm |
