Massive Selection for R32 Drilling Bits - Valve Seat Are Malting With Cemented Carbide Call – Shanghai HY Industry
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Massive Selection for R32 Drilling Bits - Valve Seat Are Malting With Cemented Carbide Call – Shanghai HY Industry,
- Valve seat are malting with cemented carbide ball.
2.wear-resistant.
3.Smooth and glossy slope surface.
