Tool bit of interchangeable tool bit formula drill bit

The utility model relates to a tool bit of interchangeable tool bit formula drill bit. Still do not have a structural design equitable at present, the machining precision is high, rotates steadily, and the tool bit clamping is convenient, firm, and the tool bit can be given up, long service life's drill bit tool bit. The utility model discloses a tool bit body and reference column, the one end at the tool bit body is fixed to the one end of reference column, the other end of tool bit body is provided with the drill tip, have main cutting edge and chisel edge thinning on the drill tip, its structural feature lies in: the both sides of tool bit body are provided with a holding surface and no. Two holding surfaces, and this holding surface and no. Two holding surfaces are planar structure, be provided with a screw hole and no. Two screw holes in the tool bit body, one end and a holding surface of a screw hole flush, one end and no. Two holding surfaces of no. Two screw holes flush. The utility model has the advantages of reasonable structure design, the machining precision is high, rotates steadily, and the tool bit clamping is convenient, firm, and the tool bit can be given up, long service life.