dents de balles en métal dur
- Fiberglass Used in certain applications, fiberglass casing is lightweight and resistant to corrosion, making it suitable for certain environments.
matériaux de forage

2, according to the aperture is not the same, the drill can be divided into light drilling rig, medium drilling rig, heavy drilling rig.
2, according to the aperture is not the same, the drill can be divided into light drilling rig, medium drilling rig, heavy drilling rig.