An insert (104; 304) comprising: a cutting face and a backwall; a cutting edge (110; 310), wherein a first region of the cutting edge (110; 310) is formed at a junction of the cutting face and a left sidewall and a second region of the cutting edge (110; 310) is formed at a junction of the cutting face and and a right sidewall, and wherein the cutting face forms a narrow outer end at a tip of the insert (104; 304) and a larger width region at a distance inward from the narrow outer end; at least one primary radius (146; 346a, 346b), wherein the at least one primary radius (146; 346a, 346b) is located at the tip of the insert (104; 304); at least two secondary radii (152a, 152b; 352a, 352b), wherein the at least two secondary radii (152a, 152b; 352a, 352b) are located on opposite sides of the cutting face near a mounting portion of the insert (104; 304); and a clearance angle, wherein the clearance angle extends from the cutting edge (110; 310), characterized by further comprising at least two outwardly extending tertiary radii (148a, 148b; 348a, 348b), wherein the at least two outwardly extending tertiary radii (148a, 148b; 348a, 348b) are located on opposite sides of the cutting face between the at least one primary radius (146; 346a, 346b) and the at least two secondary radii (152a, 152b; 352a, 352b); and at least two inwardly extending tertiary radii (150a, 150b; 350a, 350b), wherein the at least two inwardly extending tertiary radii (150a, 150b; 350a, 350b) are located on opposite sides of the cutting face between the at least two outwardly extending tertiary radii (148a, 148b; 348a, 348b) and the at least two secondary radii (152a, 152b; 352a, 352b); wherein the backwall comprises a first portion and a second portion, and the first portion intersects the second portion at an angle ranging from 1° to 20° to form a dovetail angle. a cutting face and a backwall; a cutting edge (110; 310), wherein a first region of the cutting edge (110; 310) is formed at a junction of the cutting face and a left sidewall and a second region of the cutting edge (110; 310) is formed at a junction of the cutting face and and a right sidewall, and wherein the cutting face forms a narrow outer end at a tip of the insert (104; 304) and a larger width region at a distance inward from the narrow outer end; at least one primary radius (146; 346a, 346b), wherein the at least one primary radius (146; 346a, 346b) is located at the tip of the insert (104; 304); at least two secondary radii (152a, 152b; 352a, 352b), wherein the at least two secondary radii (152a, 152b; 352a, 352b) are located on opposite sides of the cutting face near a mounting portion of the insert (104; 304); and a clearance angle, wherein the clearance angle extends from the cutting edge (110; 310), characterized by further comprising at least two outwardly extending tertiary radii (148a, 148b; 348a, 348b), wherein the at least two outwardly extending tertiary radii (148a, 148b; 348a, 348b) are located on opposite sides of the cutting face between the at least one primary radius (146; 346a, 346b) and the at least two secondary radii (152a, 152b; 352a, 352b); and at least two inwardly extending tertiary radii (150a, 150b; 350a, 350b), wherein the at least two inwardly extending tertiary radii (150a, 150b; 350a, 350b) are located on opposite sides of the cutting face between the at least two outwardly extending tertiary radii (148a, 148b; 348a, 348b) and the at least two secondary radii (152a, 152b; 352a, 352b); wherein the backwall comprises a first portion and a second portion, and the first portion intersects the second portion at an angle ranging from 1° to 20° to form a dovetail angle.