| Serial Number | F (mm) | B (mm) | C (mm) | H (mm) | R (mm) | S (mm) | T (mm) | Weight (g) |
| ER21G-05M | 5 | 29 | 16 | 28 | 10 | 1.7 | 75 | 15 |
| ER21G-06M | 6 | 33 | 18 | 30 | 10 | 1.8 | 90 | 17 |
| ER21G-08M | 8 | 36 | 24 | 37 | 13 | 2.5 | 168 | 32 |
| ER21G-10M | 10 | 42 | 28 | 43 | 15 | 2.5 | 210 | 49 |
| ER21G-12M | 12 | 48 | 33 | 50 | 17 | 2.5 | 252 | 60 |
| ER21G-14M | 14 | 58 | 38 | 57 | 20 | 2.7 | 294 | 80 |
| ER21G-16M | 16 | 61 | 40 | 62 | 23 | 3 | 336 | 120 |
| ER21G-18M | 18 | 71 | 46 | 71 | 26 | 3.5 | 378 | 215 |
| ER21G-20M | 20 | 79 | 50 | 79 | 28 | 4 | 540 | 260 |
| ER21G-22M | 22 | 87 | 56 | 84 | 30 | 4 | 594 | 399 |
| ER21G-26M | 26 | 103 | 68 | 103 | 34 | 4 | 702 | 500 |
| ER21G-30M | 30 | 118 | 79 | 121 | 42 | 5 | 990 | 865 |
| ER21G-32M | 32 | 138 | 93 | 135 | 44 | 5.5 | 1056 | 1130 |
| ER21G-35M | 35 | 140 | 100 | 147 | 52 | 6 | 1155 | 1470 |
| ER21G-40M | 40 | 173 | 116 | 170 | 56 | 6 | 1320 | 1940 |
