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DM 406 H is our powerful hydraulic core drill for drilling holes up to 650 mm diameter. An excellent choice for heavy-duty core drilling applications where high production rates are needed, especially with large diameter core bits. The hydraulic speed can be changed whilst drilling, making the DM 406 H efficient and very easy to use. Suitable for large and deep holes, waste evacuation pipes and stitch drilling in a variety of materials including reinforced concrete.