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Convex Rock Drill Button Hard Granite High Breaking Force Rock Drill. High Impact Power: Maximum impact power of 25 kW for efficient drilling in hard granite. Anti-Jamming Design: Equipped with a reverse percussion system to prevent drill tool loss and jamming. Adjustable Frequency: Impact frequency adjustable in three stages (42-50 Hz) for optimal speed. Wide Drilling Range: Designed for drilling diameters of 76-127 mm and depths up to 30 meters. Global Support: Over 100 engineers across 10 global hubs providing 24/7 technical support. Customizable Options: Customization available for power, weight, impact frequency, and rotation speed.