Button Bit, Drill Rod, Self Drilling Anchor Bolt manufacturer / supplier in China, offering (H22) 11° X 38mm Taper Drill Bit, Flat Face, Standard Skirt, Spherical, (H22) 11° X 40mm Taper Drill Bit, Flat Face, Standard Skirt, Semi-Ballistic, (H22) 11° X 40mm Taper Drill Bit, Flat Face, Standard Skirt, Ballistic and so on.