A wearing-part holder includes a first stop surface, which is arranged on the front portion of the wearing-part holder, a first contact surface and a second contact surface symmetrically arranged from a centre line L-L from the first stop surface of the wearing-part holder to a second stop surface and a third stop surface, where the second stop surface and the third stop surface are symmetrically arranged on each side of the centre line L-L from the first contact surface and the second contact surface to a third contact surface and a fourth contact surface, where the third contact surface and the fourth contact surface are symmetrically arranged on each side of the centre line L-L from the second stop surface and the third stop surface. A wearing part and a wearing-part system are also provided.