Manufactur standard Drill Picks For Hard Rock - Customized Hard Alloy Valve Seat /Spool – Shanghai HY Industry

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Manufactur standard Drill Picks For Hard Rock - Customized Hard Alloy Valve Seat /Spool – Shanghai HY Industry,


  1. 1.Valve seat are malting with cemented carbide ball.
    2.Great tightness and wear-resistant.
    3.Smooth and glossy slope surface

7 7-1 x4 xx xxx


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