Core Drilling Rig, Diamond Core Bit, PDC Bit manufacturer / supplier in China, offering Factory Direct Sales Drilling Tool 75mm 91mm 131mm PDC Core Drill Bit for Coal Mining Geological Exploration, 4 5 Inch Customized PCD Cup Wheels Diamond Grinding for Concrete Coating Removal Concrete Grinding Wheel, PCD Diamond Grinding Cup Wheel 125mm 4 5 Inch 6t for Epoxy Paint Removal and so on.