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Automatic Feed Rock Drill Machine Hydraulic Control One Hand Operation Rock Drill. High Impact Power: Maximum impact power of 25 kW with frequency of 42-50 Hz. Anti-Jamming Design: Reverse percussion system prevents jamming in fractured rock formations. Adjustable Frequency: Three-stage impact frequency adjustment for optimal drilling speed. Wide Drilling Range: Drill hole diameter of 76-127mm with depth up to 30m. Global Support: 100+ engineers across 10 global hubs for 24/7 technical support. Customizable Options: Customization available for power, weight, impact frequency, and speed.