Demo Measure ring
| Internal Diameter (MM) | USA & Canada | Adjustable Rings |
|---|---|---|
| 15 | 4 | S |
| 15.3 | 4.5 | S |
| 15.6 | 5 | S |
| 16.2 | 5.5 | S |
| 16.6 | 6 | M |
| 16.9 | 6.5 | M |
| 17.2 | 7 | M |
| 17.8 | 7.5 | M |
| 18.1 | 8 | M |
| 18.5 | 8.5 | L |
| 19.1 | 9 | L |
| 19.4 | 9.5 | L |
| 19.7 | 10 | L |
| 20.4 | 10.5 | L |
| 20.7 | 11 | L |
| Internal Diameter (MM) | USA & Canada | Adjustable Rings |
|---|---|---|
| 15 | 4 | S |
| 15.3 | 4.5 | S |
| 15.6 | 5 | S |
| 16.2 | 5.5 | S |
| 16.6 | 6 | M |
| 16.9 | 6.5 | M |
| 17.2 | 7 | M |
| 17.8 | 7.5 | M |
| 18.1 | 8 | M |
| 18.5 | 8.5 | L |
| 19.1 | 9 | L |
| 19.4 | 9.5 | L |
| 19.7 | 10 | L |
| 20.4 | 10.5 | L |
| 20.7 | 11 | L |