A milling cutter comprising: at least one insert pocket for retaining a tangential cutting insert; and at least one tangential cutting insert, the tangential cutting insert comprising: two opposing side surfaces and a peripheral surface extending therebetween, the peripheral surface comprising four identical end surfaces, each end surface extending between and adjacent to two end surfaces; each end surface and each side surface intersect at a major edge, at least a portion of the major edge being a major cutting edge; each end surface and each adjacent end surface intersect at a minor edge, at least a portion of the minor edge being a minor cutting edge, the major cutting edges being longer than the minor cutting edges, the major cutting edge having first and second major cutting edge sections (22a, 22b); each of the major and minor cutting edges of a respective end surface have a rake surface associated therewith in the respective end surface, the rake surface extending in a inward direction of the cutting insert; characterised in that in a side view of the cutting insert the major cutting edges are concave whereby when the cutting insert is mounted in the insert pocket one of the major cutting edges is an operative major cutting edge having operative first and second major cutting edge sections (22a, 22b), the first major cutting edge section having a positive axial rake and the second major cutting edge section having a negative axial rake; and wherein the rake surface extends to an inner end surface of the end surface. at least one insert pocket for retaining a tangential cutting insert; and at least one tangential cutting insert, the tangential cutting insert comprising: two opposing side surfaces and a peripheral surface extending therebetween, the peripheral surface comprising four identical end surfaces, each end surface extending between and adjacent to two end surfaces; each end surface and each side surface intersect at a major edge, at least a portion of the major edge being a major cutting edge; each end surface and each adjacent end surface intersect at a minor edge, at least a portion of the minor edge being a minor cutting edge, the major cutting edges being longer than the minor cutting edges, the major cutting edge having first and second major cutting edge sections (22a, 22b); each of the major and minor cutting edges of a respective end surface have a rake surface associated therewith in the respective end surface, the rake surface extending in a inward direction of the cutting insert; characterised in that in a side view of the cutting insert the major cutting edges are concave whereby when the cutting insert is mounted in the insert pocket one of the major cutting edges is an operative major cutting edge having operative first and second major cutting edge sections (22a, 22b), the first major cutting edge section having a positive axial rake and the second major cutting edge section having a negative axial rake; and wherein the rake surface extends to an inner end surface of the end surface. two opposing side surfaces and a peripheral surface extending therebetween, the peripheral surface comprising four identical end surfaces, each end surface extending between and adjacent to two end surfaces; each end surface and each side surface intersect at a major edge, at least a portion of the major edge being a major cutting edge; each end surface and each adjacent end surface intersect at a minor edge, at least a portion of the minor edge being a minor cutting edge, the major cutting edges being longer than the minor cutting edges, the major cutting edge having first and second major cutting edge sections (22a, 22b); each of the major and minor cutting edges of a respective end surface have a rake surface associated therewith in the respective end surface, the rake surface extending in a inward direction of the cutting insert; characterised in that in a side view of the cutting insert the major cutting edges are concave whereby when the cutting insert is mounted in the insert pocket one of the major cutting edges is an operative major cutting edge having operative first and second major cutting edge sections (22a, 22b), the first major cutting edge section having a positive axial rake and the second major cutting edge section having a negative axial rake; and wherein the rake surface extends to an inner end surface of the end surface.