Manufactur standard Drill Picks For Hard Rock - Customized Hard Alloy Valve Seat /Spool – Shanghai HY Industry
Manufactur standard Drill Picks For Hard Rock - Customized Hard Alloy Valve Seat /Spool – Shanghai HY Industry,
- 1.Valve seat are malting with cemented carbide ball.
2.Great tightness and wear-resistant.
3.Smooth and glossy slope surface