| Parameter |
Standard |
||
|
Grade А |
Grade B | ||
|
Appearance: |
|||
| shape |
Cylinders |
Rings | |
|
color |
Dark grey color |
||
| Size, mm, range: | |||
|
outer diameter |
3.0-5.5 | 11-15 | |
|
length |
5-15 |
7-15 |
|
| internal diameter | - | 6-10 | |
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