A ski binding attachment comprising: - an attachment plate designed to be mounted on a ski: - an exchangeable fastening element designed to be detachably mounted on a forward part of the attachment plate, where the attachment plate and fastening element comprise respectively one or more first locking elements (301a, 302a) and one or more second locking elements (311a, 312a), the first locking elements (301a, 302a) and the second locking elements (311a, 312a) engaging with each other and locking the fastening element in the longitudinal and lateral direction of the attachment plate when the fastening element is arranged from above and down onto the attachment plate, the first locking elements (301a, 302a) are projecting elements that extend out from respectively the fastening element and the second locking elements (311a, 312a) are opposing constrictions or apertures in the attachment plate - a vertical lock designed to lock the first and the second locking elements (301a, 302a, 311a, 3112a) to each other in the vertical direction, characterised in that the vertical lock comprises at least one pin designed to be mounted in the longitudinal direction of the mounting plate, where the attachment plate has a longitudinal upward directed first edge on one side, where - the first edge has varying width such that a second area (a) of the first edge forms the second locking element, the edge comprising at least one first area (d) adjacent to the second area (a), where the first area (d) is wider than the second area (a), and where the first area (d) has a longitudinal channel designed to receive the vertical lock. - an attachment plate designed to be mounted on a ski: - an exchangeable fastening element designed to be detachably mounted on a forward part of the attachment plate, where the attachment plate and fastening element comprise respectively one or more first locking elements (301a, 302a) and one or more second locking elements (311a, 312a), the first locking elements (301a, 302a) and the second locking elements (311a, 312a) engaging with each other and locking the fastening element in the longitudinal and lateral direction of the attachment plate when the fastening element is arranged from above and down onto the attachment plate, the first locking elements (301a, 302a) are projecting elements that extend out from respectively the fastening element and the second locking elements (311a, 312a) are opposing constrictions or apertures in the attachment plate the attachment plate and fastening element comprise respectively one or more first locking elements (301a, 302a) and one or more second locking elements (311a, 312a), the first locking elements (301a, 302a) and the second locking elements (311a, 312a) engaging with each other and locking the fastening element in the longitudinal and lateral direction of the attachment plate when the fastening element is arranged from above and down onto the attachment plate, the first locking elements (301a, 302a) are projecting elements that extend out from respectively the fastening element and the second locking elements (311a, 312a) are opposing constrictions or apertures in the attachment plate - a vertical lock designed to lock the first and the second locking elements (301a, 302a, 311a, 3112a) to each other in the vertical direction, characterised in that the vertical lock comprises at least one pin designed to be mounted in the longitudinal direction of the mounting plate, where the attachment plate has a longitudinal upward directed first edge on one side, where the vertical lock comprises at least one pin designed to be mounted in the longitudinal direction of the mounting plate, where the attachment plate has a longitudinal upward directed first edge on one side, where - the first edge has varying width such that a second area (a) of the first edge forms the second locking element, the edge comprising at least one first area (d) adjacent to the second area (a), where the first area (d) is wider than the second area (a), and where the first area (d) has a longitudinal channel designed to receive the vertical lock.