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High Speed Mining Tool R28X45mm Top Hammer Drilling Tools for Tunnel Drilling. High Performance: Fast drilling speed and high efficiency with long service life. Durable Material: Constructed from High Manganese Steel and Tungsten Carbide. Comprehensive Warranty: 2-year warranty coverage before using the product. Rapid Response Support: After-sales service available within 48 hours. ISO Certified Quality: Certified by ISO9001, SGS, CTC, and WSF for high quality. Customizable Color: Color options available upon customer request. Flexible Packaging: Wooden box, paper box, or customized packaging solutions. Global Shipping: Transfer via Air, Sea, or Express delivery methods.