A turning insert comprising a top surface, an opposite bottom surface, a reference plane between the top and bottom surfaces (2, 3), a center axis intersecting the top and bottom surfaces (2, 3), a side surface connecting the top surface and the bottom surface, a cutting edge adjacent to the top surface and the side surface, the cutting edge being circular and concentric in relation to the center axis, wherein the bottom surface comprises a set of radial grooves, wherein the bottom surface comprises a set of flat surfaces, wherein the flat surfaces extend in a plane parallel to the reference plane, wherein the top surface comprises a set of first protrusions, wherein a greatest distance from the reference plane to the first protrusions is greater than a distance from the reference plane to the cutting edge, wherein the number of first protrusions is a multiple of the number of radial grooves, wherein the first protrusion comprises a first surface facing the cutting edge characterized in that in a top view each first protrusion is symmetrical in relation to a line extending between the center axis and a mid-point of the first protrusion, wherein the first protrusions are elongated in a direction parallel to the adjacent cutting edge, wherein the top surface comprises a set of second protrusions, wherein a greatest distance from the cutting edge to the first protrusions is smaller than a greatest distance from the cutting edge to the second protrusions, wherein a distance from the reference plane to the first protrusions is smaller than a distance from the reference plane to the second protrusions, wherein the second protrusions comprises a second surface facing the cutting edge, and wherein a greatest angle of the first surface in relation to the reference plane is smaller than a greatest angle of the second surface in relation to the reference plane. a top surface, an opposite bottom surface, a reference plane between the top and bottom surfaces (2, 3), a center axis intersecting the top and bottom surfaces (2, 3), a side surface connecting the top surface and the bottom surface, a cutting edge adjacent to the top surface and the side surface, the cutting edge being circular and concentric in relation to the center axis, wherein the bottom surface comprises a set of radial grooves, wherein the bottom surface comprises a set of flat surfaces, wherein the flat surfaces extend in a plane parallel to the reference plane, wherein the top surface comprises a set of first protrusions, wherein a greatest distance from the reference plane to the first protrusions is greater than a distance from the reference plane to the cutting edge, wherein the number of first protrusions is a multiple of the number of radial grooves, wherein the first protrusion comprises a first surface facing the cutting edge in a top view each first protrusion is symmetrical in relation to a line extending between the center axis and a mid-point of the first protrusion, wherein the first protrusions are elongated in a direction parallel to the adjacent cutting edge, wherein the top surface comprises a set of second protrusions, wherein a greatest distance from the cutting edge to the first protrusions is smaller than a greatest distance from the cutting edge to the second protrusions, wherein a distance from the reference plane to the first protrusions is smaller than a distance from the reference plane to the second protrusions, wherein the second protrusions comprises a second surface facing the cutting edge, and wherein a greatest angle of the first surface in relation to the reference plane is smaller than a greatest angle of the second surface in relation to the reference plane.