Electric hand-held core drill having a tool fitting for receiving a diamond core bit , wherein the tool fitting has a receiving sleeve and a tool fitting piece arranged therein, which is driven in operation direction of rotation (BR) about an axis of rotation (R) during operation of the hand-held core drill , and having a compression spring arrangement which is arranged within the receiving sleeve and which supports the receiving sleeve and the tool fitting piece resiliently with respect to one another, wherein the receiving sleeve has a central insertion opening through which a shank of the diamond core bit can be introduced into the tool fitting piece when the shank is located in an insertion rotational position with respect to the insertion opening and the compression spring arrangement is under compressive load, and in which the shank is secured against being pulled out coaxially with the axis of rotation (R) when the shank is located in the tool fitting piece and is in a blocking rotational position (SL) with respect to the insertion opening and the compression spring arrangement is under comparatively less compressive load, wherein exactly three uniformly spaced-apart retaining tabs are formed on the receiving sleeve along a circumferential direction (UR) of the insertion opening , said retaining tabs each having a stop surface which respectively faces the tool fitting piece , wherein the shank , when it is secured against being pulled out coaxially with the axis of rotation (R), bears against the stop faces by means of three contact faces formed on the shank , wherein exactly three uniformly spaced-apart bearing faces are formed on the tool fitting piece along a circumference (UW) of the tool fitting piece , said bearing faces each facing the stop faces , wherein the bearing faces for their part form an axial stop, oriented in the opposite direction with respect to the stop faces , for the shank , located in the blocking rotational position (SL), of the diamond core bit by means of mating bearing faces formed on the shank , wherein exactly three uniformly spaced-apart pegs project from the bearing faces , each delimiting the bearing faces on one side, with a peg face being formed on each peg , the respective surface normal of which is oriented perpendicularly to the axis of rotation (R) and at a tangent to the circumference (UVη, such that torque transmission in the operation direction of rotation (BR) from the tool fitting piece to the shank , when the latter is located in the blocking rotational position (SL) and the compression spring arrangement is under comparatively less compressive load, takes place only by way of a form fit between the three peg faces and peg mating faces , corresponding thereto, on the shank , wherein each of the three peg faces is at most half as wide in the radial direction (RR) as a respective bearing face in the radial direction (RR), wherein the pegs each have a plateau which is spaced apart from the bearing face and the respective surface normal of which is oriented parallel to the axis of rotation (R), characterized in that the stop faces are planar such that they form a sliding contact with the corresponding contact faces on the shank and thus, at least in the region of the stop faces between the receiving sleeve and shank , with the shank located in the blocking rotational position (SL), a degree of rotational freedom about the axis of rotation (R) remains unsecured and a respective peg face is perpendicular to the respective plateau and delimits a peg tip which extends from the plateau in the direction of the respective retaining tab . <EOS>