Diamond Drill Bit, Diamond Core Drill Bit, Diamond Saw Blade manufacturer / supplier in China, offering 450mm Laser Welded for Dry and Wet Drilling Granite/Reinforced Concrete Diamond Drill Bit, 32mm Diamond Segment Dry & Wet for Block/Concrete High-Frequency Teeth Welding Core Drill Bits, Customized for Granite Marble Dry or Wet Drilling 12mm 1/2bsp Sintered Stone Diamond Core Bit and so on.