Mechanical locking system for floor panels

Building panels provided with a locking system comprising a tongue groove at a first edge of a first panel, the tongue groove being configured to cooperate with a tongue at a second edge of a second panel for locking in a vertical direction and the tongue groove comprising an upper lip and a lower lip,

• wherein the locking system further comprises one or more clips configured to be attached to the first edge, wherein an inner part of each clip comprises a fixing element configured to cooperate with a downwardly open fixing groove provided in a rear side of the first panel for locking the one or more clips to the first edge in a horizontal direction, and wherein each clip comprises a locking protrusion protruding upwardly, said locking protrusion being configured to lock the one or more clips to the first edge in a vertical direction,
• wherein the lower lip or the tongue comprises a recess, the locking protrusion being positioned in said recess in a locked position,
• wherein the locking system comprises a sliding surface configured to guide the tongue into the tongue groove during locking and/or to position the one or more clips horizontally against the lower lip, and
• wherein a length direction extends along the first and second edges perpendicularly to the vertical and horizontal directions, and wherein in the locked position, the locking protrusion does not extend beyond the recess in the length direction.