Professional diamond core bit crown for wet drilling through concrete, re-inforced concrete and hard materials. Professional diamond core bit for effectively drilling concrete with excessive amounts of steel rebar. Drill bits sizes 12mm & 14mm also available in lengths up to 1000mm. Sizes 16mm - 50mm also available in lengths up to 2000mm. 1/2" BSP connection. Click here to also view our dry diamond core bit drill bits.