Tangential cutting insert and insert holder

An indexable cutting insert comprising:

• two identical opposing end surfaces having 180° rotational symmetry about a first axis passing therethrough,
• a peripheral side surface extending between the two opposing end surfaces, and
• a peripheral edge formed at the intersection of each end surface and the peripheral side surface, at least two sections of each peripheral edge constituting cutting edges;
• the peripheral side surface comprising:
• two identical opposing major side surfaces having 180° rotational symmetry about a second axis passing therethrough, the second axis being perpendicular to the first axis;
• and
• two identical opposing minor side surfaces having 180° rotational symmetry about a third axis passing therethrough, the third axis being perpendicular to the first axis and the second axis;
• a major plane defined by the first axis and the second axis;
• a minor plane defined by the first axis and the third axis;
• a median plane being defined by the second axis and the third axis;
• each end surface having four corners, two lowered corners and two raised corners, the lowered corners being closer to the median plane than the raised corners;
• in a side view of one of the minor side surfaces, all four corners are equidistant from the minor plane;
• in a side view of one of the major side surfaces, all four corners are equidistant from the major plane.