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2018 Hjg Big Hole Rock Drilling DTH Hammer HD525. High Efficiency Design: Optimized air distribution structure for faster drilling speed and lower air consumption. Anti-Shedding Device: Safe and reliable device designed to prevent bit breakage and retrieval difficulties. Easy Maintenance: Replaceable check valve with larger hole and special threads for easier disassembly. OEM & ODM Support: Accepts both OEM and ODM services for customized manufacturing needs. Low MOQ: Minimum order quantity is just 1 piece or 1 complete set. 17 Years Experience: Manufacturer with over 17 years of R&D, manufacturing, and export experience. Global Export: 50-70% export rate covering Korea, Malaysia, Australia, Russia, Europe, and Africa.