| If your Objective (the bell itself, not the glass) Outside Diameter Measurement is this size | For 1 inch tubes you will generally need rings at least this high from the top of the base to the bottom of the scope tube | For 30mm tubes you will generally need rings at least this high from the top of the base to the bottom of the scope tube |
| 25mm, .984 inches | .150 inches | |
| 26mm, 1.023 inches | .150 inches | |
| 27mm, 1.062 inches | .150 inches | |
| 28mm, 1.102 inches | .150 inches | |
| 29mm, 1.141 inches | .150 inches | |
| 30mm, 1.181 inches | .150 inches | |
| 31mm, 1.122 inches | .150 inches | |
| 32mm, 1.259 inches | .150 inches | |
| 33mm, 1.299 inches | .150 inches | |
| 34mm, 1.338 inches | .150 inches | |
| 35mm, 1.377 inches | .150 inches | |
| 36mm, 1.417 inches | .270 inches | |
| 37mm, 1.456 inches | .270 inches | |
| 38mm, 1.496 inches | .270 inches | |
| 39mm, 1.535 inches | .270 inches | |
| 40mm, 1.574 inches | .270 inches | |
| 41mm, 1.614 inches | .270 inches | |
| 42mm, 1.653 inches | .270 inches | |
| 43mm, 1.692 inches | .270 inches | |
| 44mm, 1.732 inches | .270 inches | |
| 45mm, 1.771 inches | .270 inches | |
| 46mm, 1.811 inches | .270 inches | |
| 47mm, 1.850 inches | .270 inches | |
| 48mm, 1.889 inches | .270 inches | |
| 49mm, 1.929 inches | .270 inches | |
| 50mm, 1.968 inches | .270 inches | .300 inches |
| 51mm, 2.000 inches | .270 inches | .300 inches |
| 52mm, 2.047 inches | .270 inches | .300 inches |
| 53mm, 2.086 inches | .270 inches | .300 inches |
| 54mm, 2.125 inches | .270 inches | .300 inches |
| 55mm, 2.165 inches | .270 inches | .300 inches |
| 56mm, 2.204 inches | .390 inches | .300 inches |
| 57mm, 2.244 inches | .390 inches | .300 inches |
| 58mm, 2.283 inches | .390 inches | .300 inches |
| 59mm, 2.322 inches | .390 inches | .300 inches |
| 60mm, 2.362 inches | .390 inches | .300 inches |
| 61mm, 2.401 inches | .390 inches | .410 inches |
| 62mm, 2.440 inches | .390 inches | .410 inches |
| 63mm, 2.480 inches | .390 inches | .410 inches |
| 64mm, 2.519 inches | .500 inches | .410 inches |
| 65mm, 2.559 inches | .500 inches | .410 inches |
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