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42mm Tapered 7 Degree 11 Degree 12 Degree Kaiyu Rock Drill Jack Hammer Bit. Multi-Diameter Options: Available in 32mm to 80mm diameters for various drilling needs. Customizable Colors: Offered in Golden, Blue, Red, and other custom color options. High-Grade Materials: Constructed from 35CrMoNiV alloy steel and high-grade tungsten carbide. Long Manufacturing History: Over 48 years of specialized experience in drilling tools manufacturing. Rapid Delivery: Standard delivery time ranges from 7 to 15 days. OEM/ODM Services: Full OEM and ODM services available with 2 dedicated R&D engineers. Global Certification: Certified under ISO9001:2015 and SGS standards.