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Long Skirt Short Skirt Rock Drilling Taper Button Bit H22, H25, 7buttons, 3 Flushing Holes, D32~45. High Efficiency Button Bits: Features tungsten carbide inserts for longer drilling time and higher efficiency. Versatile Taper Designs: Available in chisel, cross, and button types for various rock formations. Customizable Specifications: Color and configuration can be customized on request. Durable Alloy Steel: Forged from high carbon steel with spray-paint surface treatment. Wide Diameter Range: Supports drilling diameters from 20mm to 55mm. OEM/ODM Support: Full customization from samples, designs, or minor adjustments. ISO 9001 Certified: Manufacturing process meets ISO 9001:2000 standards.