This product guide contains the specification for D Rings, a series of standard marine parts available from Westfield Fasteners.

| diameter, d | Length | width, W |
|---|---|---|
| 3 | 15 | 12 |
| 3 | 20 | 17 |
| 4 | 20 | 17 |
| 4 | 25 | 22 |
| 4 | 30 | 27 |
| 5 | 25 | 22 |
| 5 | 30 | 27 |
| 5 | 50 | 45 |
| 6 | 30 | 27 |
| 6 | 40 | 37 |
| 6 | 50 | 47 |
| 8 | 50 | 47 |