518mm OD Overburden Drilling Systems Durable Tungsten Carbide Material

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Changsha Tianhe Drilling Tools and Machinery Co.,Ltd.

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518mm OD Overburden Drilling Systems Durable Tungsten Carbide Material

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518mm OD Overburden Drilling Systems Durable Tungsten Carbide Material

518mm Concentric overburden drill bit with blocks Specification 1.Face: Flat,Convex,Concave,Drop-center. 2.Carbide Button Shape: Spherical,Semi-ballistic,Ballistic and Two-step 3.Bit Shank: COP/DHD/QL...

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symmetrix drilling system

concentric drilling system

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