DM 406 H is our powerful hydraulic core drill for drilling holes up to 24 in. 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 while 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.