2 x Hilti Diamond Core Bit 25mm #336876 DD-C 25/300T4. Brand new and boxed. Ultimate core bit for coring in very abrasive concrete – for use with the DD EC-1 and DD 30-W incl. Hilti C+ quick-release connection end. Base materials: Concrete (abrasive). Drilling mode: Hand-held, Rig-mounted. Wet or dry operation: Wet.