for professional users, bridge engineering, metro engineering, high-grade reinforced concrete drilling.  

Specitications         Unit:mm Outer Diameter Length A Length B Segment Dimensions Number of segment Inch Metric     Thickness Hight   1 1/8″ 27 375 450 3.7 8.5 3 1 1/3″ 32 375 450 3.7 8.5 3 1 2/5″ 36 375 450 3.7 8.5 3 1 3/4″ 44 375 450 3.7 8.5 5 2″ 51 375 450 3.6 8.5 5 2 1/4″ 56 375 450 4 8.5 5 2 1/2″ 63 375 450 4 8.5 6 3″ 76 375 450 4 8.5 7 3 1/4″ 83 370 450 4 8.5 8 3 1/2″ 89 370 450 4 8.5 9 3 3/4″ 96 350 420 4 8.5 9 4″ 102 350 420 4 8.5 10 4 3/4″ 120 350 420/500 4 8.5 11 5″ 127 350 420 4.2 8.5 12 5 1/5″ 132 350 420/500 4.5 8.5 13 6″ 152 350 420 4.5 8.5 14 6 1/3″ 160 350 420 4.5 8.5 16 7″ 180 350 420 4.5 8.5 18 Blue Diamond Series: for general civil, concrete, brick wall punch. Red Diamond Series: for professional users, bridge engineering, metro engineering, high-grade reinforced concrete drilling.

diamond core drill bit