Made in Bradford, England, Bowers setting rings allow for fast, efficient accuracy setting of any of any of the Bowers’ XT bore gauge ranges, including XTA, XTD and XTH.
| XTR3M | 2.5 | POA |
| XTR5M | 4.00 | POA |
| XTR7M | 5.00 | POA |
| XTR8M | 8.00 | POA |
| XTR12M | 12.50 | POA |
| XTR20M | 20.00 | POA |
| XTR35M | 35.00 | POA |
| XTR65M | 135.50 | POA |
| XTR80M | 80.00 | POA |
| XTR125M | 125.00 | POA |
| XTR175M | 175.00 | POA |
| XTR225M | 225.00 | POA |
| XTR275M | 275.00 | POA |