Product name: 33mm Diameter R22 Down The Hole Thread DTH Button Drill Bit For Oil Gas Drilling Rig Product category: DTH thread button drill bit Matched connection: R22 Diameter: 33mm Matched: shank rod, and MM ... Read More
Product Name: 238mm MRING Overburden Symmetric Casing Drilling System Bit For Borehole Drilling Machine External Dia.(mm): 238mm Product details: Rock drilling tools factory KINGDRILLING professionally produce ... Read More