The diamond core drill bits are also called diamond hole saw. This tool is designed for drilling brick, stones, concrete, and other construction materials. Some projects are to get the core material for analyzing or others using, but most cases are to get the holes, like the hole for air conditioner, hole for pipe, etc. Sunny uses imported diamond particles (Element Six) from Ireland on most of our core drill bits, to ensure its high performance. We also developed various shapes of the diamond segment to enhance its drilling performance, like "Roof Shape", "Arix Shape", "Crown Shape", "Turbo Shape" and others. We have different excellent formulas of these shapes of segments according to different applications. For core bit retipping, we also prepared the magnet holder to help to locate the core drill bit segments. Features: Imported diamond particles from Ireland - "Element Six" Various diamond segment shape to choose from Excellent diamond segment formulas according to different applications High performance & long lifespan Diamond Core Drill Bit Segments and Magnet Holder for Retipping  Optional Size of diamond core bit (other specifications are available upon requests) OUTER DIA. DRILL DEPTH NO.OF OUTER DIA. DRILL DEPTH NO.OF mm mm Segs. mm mm Segs. φ25 450 3 φ125 450 11 φ28 450 3 φ130 450 11 φ30 450 3 φ135 450 11 φ32 450 3 φ140 450 12 φ35 450 3 φ145 450 12 φ38 450 4 φ150 450 12 φ40 450 4 φ160 450 12 φ45 450 4 φ170 450 12 φ51 450 5 φ180 450 13 φ55 450 5 φ190 450 13 φ60 450 5 φ200 450 15 φ65 450 6 φ210 450 16 φ70 450 6 φ248 450 16 φ75 450 7 φ298 450 17 φ80 450 7 φ348 450 20 φ90 450 8 φ398 450 28 φ100 450 9 φ449 450 32 φ108 450 9 φ498 450 35 φ112 450 9 φ548 450 38 φ118 450 10 φ598 450 42 φ120 450 10