TCT Core Drill Bit 80mm Overview Heavy duty tungsten carbide tipped core drills. For cutting clean holes in concrete, brick and aerated block." name="description"/> TCT Core Drill Bit 80mm Overview Heavy duty tungsten carbide tipped core drills. For cutting clean holes in concrete, brick and aerated block." property="og:description"/> TCT Core Drill Bit 80mm Overview Heavy duty tungsten carbide tipped core drills. For cutting clean holes in concrete, brick and aerated block." name="twitter:description"/>