Set of building panels comprising a locking device

A set of building panels comprising a first panel and a second panel and a locking device for locking a first edge portion of the first panel to a second edge portion of the second panel, the first and second edge portions being configured to be joined to each other by a relative essentially vertical displacement of the first and second panels against each other, the locking device comprising:

• a locking element extending upwards from a lower strip provided in the first edge portion, and a locking member extending downwards from an upper strip provided in the second edge portion, wherein the locking element and the locking member are configured to cooperate for horizontal locking of the first and second edge portions, and
• a protrusion and a groove arranged in the first and second edge portions, wherein the protrusion and the groove are configured to cooperate for vertical locking of the first and second edge portions,
• wherein the protrusion protrudes outwards from the second edge portion and the groove is arranged in the first edge portion, and
• wherein a perpendicularly arranged fourth edge portion of the second panel comprises a further locking device comprising a tongue configured to cooperate with a tongue groove of an adjacent panel for vertical locking,
• wherein the protrusion extends longitudinally along the second edge portion,
• wherein a longitudinal end of the second edge portion is defined by a tip of the tongue,
• wherein a longitudinally outermost portion of the protrusion is longitudinally inside of the longitudinal end of the second edge portion, and
• wherein the further locking device comprising a further locking groove configured to cooperate with a further locking element provided on a further strip of an adjacent panel for horizontal locking, the longitudinally outermost portion of the protrusion being longitudinally inside of the further locking groove in the direction along the second edge portion.