Space welding: cold welding process according to cutting-edge bonding technology. Use of the complete diamond segment without waste due to a neutral zone PRISMACUT: Four drill nodules on the diamond segment improve the drill behaviour and provide optimal water cooling at the same time Exact rotation reduces wear Easy and secure first cut in hand-operated mode Installers, service technicians or electricians can quickly and easily drill holes in reinforced concrete (wet), masonry or sand-lime brick (both dry) up to a depth of 400 mm without an extension using the hand-guided or stationary core drilling system and the Speed Star DX diamond core bit.