Diamond core drill bits are designed for drilling into tough materials like reinforced concrete, brick and stone. While they have many applications, they are primarily used for cutting holes into solid walls so tradesmen can install cables, ventilation and waste pipes. Our comprehensive range of diamond core drill bits are filled with fine diamond powder for unrivalled grinding power. We stock core drill bit sets for plumbers and electricians as well as dry, wet and TCT diamond core drill bits from trusted manufacturers like Spectrum Diamond.