Button Bit, Drill Rod, Self Drilling Anchor Bolt manufacturer / supplier in China, offering Maxdrill R32 51mm Tungsten Carbide Drill Bits Button Bits for Mining Machine Parts, Maxdrill R103 Self-Drilling Hollow Anchor Bar for Geotechnical and Tunneling Projects, Maxdrill T38 102mm Dome Bit Forging Process Supported for Testing Samples and so on.