Concrete hole saw - other names are concrete core drill bit and concrete core bit, is an ideal diamond tool for drilling concrete and reinforced concrete. The welding type can be laser welding or high-frequency welding. Laser welding type costs more and is mainly used for reinforced concrete. High-frequency welding type is cheaper and can be used for concrete and reinforced concrete with less steel. Every project is different. Sunny Superhard Tools provides you with various excellent diamond segment formulas to fit different materials. You can customize the size(diameter and working length) and connection type (usually is 1 1/4-7 UNC) according to your projects. The 8 inch concrete hole saw on this page is for wet drilling and uses roof type diamond segments, which most of our concrete hole saws are used. Imported high-quality diamonds from Ireland Company - "Element Six" strengthens its high performance. We also provide other related products like core drill bit segment and magnet holder for core bit retipping. Wet concrete hole saw for concrete and reinforced concrete. Roof type core bit segments make the drilling easily started. Imported diamonds enhanced the performance and brought longer lifespan. The sizes can be customized upon your request. 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