The present invention relates to a core bit for a core drill, and more particularly, to a core bit for a core drill. More specifically, a plurality of inner and outer dust guide grooves are formed on an outer circumferential surface and an inner circumferential surface of the cutting tip along a rotating direction, And it is possible to easily discharge the dust generated in the drilling operation from the beginning, thereby improving the discharge performance of the dust, thereby minimizing the cutting resistance due to the dust in the boring process and accordingly increasing the cutting force. In addition, And the outer diameter of the hole is further processed on the outer circumferential surface of the shank to prevent the dust from stagnating, thereby improving the cutting force due to the reduction in the rotational resistance of the shank. And a plurality of internal cutting projections made of diamond are formed on the inner peripheral surface of the shank, The present invention relates to a core bit for a core drill for cutting a circumferential surface of a shank and forming a space between the shank and a perforated block and preventing the interference of the shank and the perforated block, will be.
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