ROOFTOP - Core BitsDesigned for both light and heavy duty drilling, our premium quality laser welded diamond segments provide the best drilling speeds and maximum performance. Available for both reinforced concrete and abrasive materials. The Rooftop Concrete Core Bits is developed for a long life and enables a fast starting of cut. For reinforced concrete, exposed aggregate and precast concrete, the core bit is available in a range of diameters from 12mm to 610mm and