Dimensions (inches)
| The Gape Keeper | 55 | 65 | 75 | 85 | 93 | 100 | 108 | 116 | 128 | 140 | 150 |
| Max Circumference | 5.5 | 6.5 | 7.5 | 8.5 | 9.3 | 10 | 10.8 | 11.6 | 12.8 | 14 | 15 |
| Max Diameter | 1.75 | 2.1 | 2.4 | 2.7 | 3 | 3.2 | 3.4 | 3.7 | 4.1 | 4.5 | 5.1 |
| Neck Circumference | 3.3 | 4 | 4.5 | 5.5 | 6.2 | 7 | 7.5 | 8 | 8.7 | 9.5 | 10.8 |
| Neck Diameter | 1 | 1.2 | 1.4 | 1.8 | 2 | 2.2 | 2.4 | 2.6 | 2.8 | 3 | 3.4 |
| Insertable | 4.75 | 4.8 | 5.5 | 5.5 | 6.25 | 6.5 | 6.75 | 7 | 6.8 | 6.5 | 6.5 |
Dimensions (cm)
| The Gape Keeper | 55 | 65 | 75 | 85 | 93 | 100 | 108 | 116 | 128 | 140 | 150 |
| Max Circumference | 14 | 16.5 | 19 | 21.6 | 23.6 | 25.4 | 27.4 | 29.5 | 32.5 | 35.5 | 38.1 |
| Max Diameter | 4.4 | 5.3 | 6.1 | 6.9 | 7.6 | 8.1 | 8.6 | 9.4 | 10.4 | 11.4 | 13 |
| Neck Circumference | 8.4 | 10 | 11.5 | 14 | 15.3 | 17.8 | 19 | 20.3 | 22.1 | 24.1 | 27.4 |
| Neck Diameter | 2.7 | 3 | 3.5 | 4.6 | 4.8 | 5.6 | 6.4 | 6.6 | 7.1 | 7.6 | 8.6 |
| Insertable | 12 | 12.1 | 14 | 14 | 15.9 | 16.5 | 17.1 | 17.8 | 17.3 | 16.5 | 16.5 |