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Extreme stability through core strengthening, thereby providing maximum power transmission from hammer drill to drill bit. High wear resistance due to special blasting treatment for hardening. Spiral geometry for optimal drilling dust removal. Particularly suitable for fastening techniques, because a wear mark serves as a control point and thus ensures an exact drill diameter. Applications: for granite, concrete, clinker, stone, brick, tile and marble. In all hammer drills with SDS-plus adaptor and 2-groove adaptor.