Draper 12 x 225mm TCT Tapered Guide Drill for Diamond Core Bits Draper Drift for Diamond Core Bits Draper Diamond Core Bit, 28 x 300mm Draper Diamond Core Bit, 38 x 150mm Draper Diamond Core Bit, 52 x 150mm Draper Diamond Core Bit, 78 x 150mm Draper Diamond Core Bit, 107 x 150mm Draper Diamond Core Bit, 117 x 150mm Draper Diamond Core Bit, 127 x 150mm Draper Diamond Core Bit, 152 x 150mm Draper Extension Arbor for Diamond Core Bits, 200mm Draper Hex. Arbor for Diamond Core Bits, 240mm