200mm Diamond Core Drill Bits Hole Cutter Block/ Brick (Genuine Neilsen CT0857). Diamond Core Bit 200mm Single Piece. Core can be removed in one piece. Suitable for concrete, brick, paving slabs, asphalt, limestone, clay bricks and aerated block. 1 X Core 200mm X 150mm Drill; 1 X SDS arbor. 1 X Guide remover tool; 1 X Hex adaptor; 1 X Tapered guide drill.