28mm Outer Diameter R17 Thread Tungsten Carbide YG8 Rock Bolt Drill Bit And Anchor Drill Bit For Coal Mine Roof Bolting The Henglong 28R17 anchoring bit is engineered for roof bolting holes in underground coal mine support operations. It delivers reliable tensile strength and abrasion resistance, maintaining stable drilling progress even through tough, hard rock strata. R17 Thread 28 mm Diameter YG8 / YG6 Carbide 42CrMo Alloy Steel Technical Specifications Thread R17 Outer
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