A cutting insert comprising: opposing end surfaces and a peripheral side surface extending therebetween, the peripheral side surface comprising a major side surface; a major cutting edge formed at the intersection of the major side surface with one of the end surfaces; wherein: the major side surface has recesses formed therein interrupting the major cutting edge at recessed cutting edge portions, each recessed cutting edge portion being located between two non-recessed cutting edge portions; each recessed cutting edge portion comprising, in an end view of the cutting insert, viewing the end surface with the major cutting edge, a curved central section located between two curved side sections, the central section having a first radius of curvature and each side section having a second radius of curvature, the first radius of curvature being larger than the second radius of curvature, characterized in that the first radius of curvature is in the range 0.7 to 0.9 mm and the second radius of curvature is in the range 0.3 to 0.5 mm and in that the cutting insert comprises a central axis which passes through a through bore passing between the opposing end surfaces; and the end view is a view along the central axis. opposing end surfaces and a peripheral side surface extending therebetween, the peripheral side surface comprising a major side surface; a major cutting edge formed at the intersection of the major side surface with one of the end surfaces; wherein: the major side surface has recesses formed therein interrupting the major cutting edge at recessed cutting edge portions, each recessed cutting edge portion being located between two non-recessed cutting edge portions; each recessed cutting edge portion comprising, in an end view of the cutting insert, viewing the end surface with the major cutting edge, a curved central section located between two curved side sections, the central section having a first radius of curvature and each side section having a second radius of curvature, the first radius of curvature being larger than the second radius of curvature, characterized in that the first radius of curvature is in the range 0.7 to 0.9 mm and the second radius of curvature is in the range 0.3 to 0.5 mm and in that the cutting insert comprises a central axis which passes through a through bore passing between the opposing end surfaces; and the end view is a view along the central axis. the major side surface has recesses formed therein interrupting the major cutting edge at recessed cutting edge portions, each recessed cutting edge portion being located between two non-recessed cutting edge portions; each recessed cutting edge portion comprising, in an end view of the cutting insert, viewing the end surface with the major cutting edge, a curved central section located between two curved side sections, the central section having a first radius of curvature and each side section having a second radius of curvature, the first radius of curvature being larger than the second radius of curvature, characterized in that the first radius of curvature is in the range 0.7 to 0.9 mm and the second radius of curvature is in the range 0.3 to 0.5 mm and in that the cutting insert comprises a central axis which passes through a through bore passing between the opposing end surfaces; and the end view is a view along the central axis.