Mechanical locking of floor panels

A set of floor panels provided with a locking system comprising a tongue at an edge of a first floor panel and a tongue groove in an adjacent edge of a similar second floor panel for connecting the edges vertically wherein the tongue and the tongue groove are displaceable in relation to each other, the tongue comprises a protrusion extending horizontally beyond the upper part of the edge and the tongue groove comprises a protrusion and a cavity configured such that the adjacent edges can obtain a vertically unlocked position where the protrusion of the tongue matches the cavity of the tongue groove and a vertically locked position where the protrusion of said tongue vertically overlaps the protrusion of said tongue groove,

• wherein the tongue and the tongue groove each comprise several protrusions and cavities,
• wherein the protrusions and cavities of the tongue groove and the tongue are formed in one piece with their respective panel,
• wherein the locking system comprises a locking strip with an upwardly directed locking element at the edge of the first floor panel and a downwardly open locking groove at the adjacent edge of the second floor panel for connecting the adjacent edges in a horizontal direction perpendicular to the adjacent edges,
• wherein the locking strip protrudes beyond the upper part of the edge of the first floor panel,
• the edges are configured to be locked with a vertical motion.