The integral cemented carbide bit is made of fine cemented carbide material, which is coated to delay the service life. The specially designed geometric blade makes the bit self-centering and has accurate chip control and chip removal function during drilling. The self-centering function and strict manufacturing accuracy of the bit ensure the quality of drilling holes, eliminating the need for further finishing after drilling.Epsilon-type blade edge and the negative rear angle design of crossed blade ensure the smooth bottom of the hole.The four axis cnc machining center tool guarantees the accuracy effectively by the one-step molding technology.