A drill bit with chamfering function has a body, a chamfering blade, an abutting rod, an elastic element, an adjusting element, and a drill bit. The body is a hollow tube, and has an internal space, a blade opening, a pivot segment, and a connecting end. The chamfering blade is pivotally connected to the body, selectively extends out of the blade opening, and has a blade portion, a blade pivot portion, and an abutting portion. The abutting rod is disposed in the internal space and abuts against the abutting portion. The elastic element is disposed in the internal space and is compressed between the abutting rod and the adjusting element. The adjusting element is disposed in the internal space for adjusting an amount of compression of the elastic element. The drill bit is securely connected to the connecting end of the body.

A combined drill and chamfer tool (13, 21) for producing boreholes (29) in a workpiece (28) and for subsequently producing a chamfer (30) on at least one bore edge of the borehole (29), comprising a drill bit (1), which is secured in a rotationally fixed manner in a base body (3), and at least one chamfering blade (4) arranged behind the drill bit (1) in the axial direction, said chamfering blade being mounted in a blade window (25) arranged in the drill shank (35) and spring-loaded so as to be displaceable transversely to the longitudinal axis of the combined tool (13, 21), wherein the drill body (13) comprising the drill bit (1) and the drill shank (35) is made of a solid hard metal material, and wherein a spring-loaded, displaceable control bolt (5) is located in a central longitudinal bore (36) of the solid hard metal drill, the front tip (15) of said bolt controlling the transverse displacement of the chamfering blade (4), which is transversely displaceable within the blade window (25).

Deburring blade for deburring bore margins with an even or uneven shape, having a base body (1) which is rotatably driven about its longitudinal axis, in which base body at least one bar blade (3) is held exchangeably in a spring-loaded, swivelably mounted blade holder (2) in the base body (1) in a radial bar blade bore (7) of the blade holder (2), and the blade holder (2) is designed as an approximately cylindrical body, which is mounted rotatably in a bearing bore (6) of the base body (1).