Professional Quality Cut 11 Piece Diamond Core Drill Set Supplied with: 1 x Long SDS Adaptor - 245 mm 1 x Short SDS Adaptor - 115 mm 1 x Long Hexagon Adaptor - 245 mm 1 x Short Hexagon Adaptor - 88 mm 1 x Drift Key 1 x SDS Drill Bit Core Drill size (mm) 38, 52, 65, 117 & 127 Suitable for use with Brickwork, Block work and Concrete. Laser-welding represents the latest advance in diamond disc fabrication technology. The advantages include high automatization, excellent stability and strong adhesion between the segment and the steel base. Discs manufactured using this technology allow for a long lifetime and high efficiency. *other sizes and specifications are available upon request.