Product Name: Thread Tungsten Carbide Button Bits Rock Drilling Tools for Tunneling Material: Cast Steel Manufacturing Process: Forging Surface Treatment: Spray-Paint Standard: GB Certification: ISO 9001:2008 Product: DTH Drill Button Bits Keywords: DTH Drill Bits Application: for Down The Hole, Mining Transport Package: Wooden Box Specification: 90-450mm Origin: Zhuzhou Product Description Thread Tungsten Carbide Button Bits Rock Drilling Tools For TunnelingProduct Information:1. wear resistance2. high efficiency3. long service life4. direct selling with reasonable price5. MOQ: 1pcs for checking the quality6.customized order is available