Internal surface, base, top and bottom ring are accurately machined.
Available in different dimensions and weights:
| Models | Dimensions Ø x height mm | Weight Kg |
| C258 | 100x200 | 8 |
| C258-01 | 112.8x220 | 8 |
| C258-02 | 150x300 | 15 |
| C258-03 | 6"x12" | 15 |
| C258-04 | 159.6x320 | 17 |
| C258-04 CO | 159.6x320 | 18 |
| C258-05 | 250x500 | 80 |
| C258-06 | 150x150 | 10 |
