A turning insert comprising a top surface , an opposite bottom surface , a reference plane (RP) between the top and bottom surfaces , a center axis (A1) intersecting the top and bottom surfaces , 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 (A1), 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 (RP), wherein the top surface comprises a set of first protrusions , wherein a greatest distance from the reference plane (RP) to the first protrusions is greater than a distance from the reference plane (RP) 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 (A1) 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 (RP) to the first protrusions is smaller than a distance from the reference plane (RP) to the second protrusions , wherein the second protrusions comprises a second surface facing the cutting edge , and wherein a greatest angle (e1) of the first surface in relation to the reference plane (RP) is smaller than a greatest angle (e2) of the second surface in relation to the reference plane (RP). a top surface , an opposite bottom surface , a reference plane (RP) between the top and bottom surfaces , a center axis (A1) intersecting the top and bottom surfaces , 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 (A1), 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 (RP), wherein the top surface comprises a set of first protrusions , wherein a greatest distance from the reference plane (RP) to the first protrusions is greater than a distance from the reference plane (RP) 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 (A1) 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 (RP) to the first protrusions is smaller than a distance from the reference plane (RP) to the second protrusions , wherein the second protrusions comprises a second surface facing the cutting edge , and wherein a greatest angle (e1) of the first surface in relation to the reference plane (RP) is smaller than a greatest angle (e2) of the second surface in relation to the reference plane (RP). <EOS>