Panels comprising a mechanical locking device and an assembled product comprising the panels

A set of panels comprising a first panel having a first main plane and a second panel having a second main plane, wherein the first panel and the second panel are provided with a mechanical locking device for locking a first edge of the first panel to a second edge of the second panel, wherein the first main plane is essentially perpendicular to the second main plane, wherein the first panel comprises a core comprising fibres arranged essentially parallel to the first main plane and the second panel comprises a core comprising fibres arranged essentially parallel to the second main plane, and the mechanical locking device comprises:

• an edge section groove at the first edge of the first panel, wherein an edge section of the second edge of the second panel is insertable into the edge section groove for locking the first panel and the second panel together in a direction parallel to the first main plane;
• and
• a flexible tongue arranged in an insertion groove provided in the edge section groove, wherein said flexible tongue cooperates with a tongue groove provided at the edge section of the second panel, for locking the first panel and the second panel in a direction parallel to the second main plane,
• wherein a first thickness, measured in a direction parallel to the first main plane, of a core material of the first panel between the edge section groove and an outermost surface of the first edge, which outermost surface extends in a direction essentially perpendicular to the first main plane, is greater than a minimum second thickness of a core material from one side of the edge section of the second panel to an opposite side of the edge section of the second panel,
• wherein the outermost surface of the first edge of the first panel is essentially flush with an outer face of the second panel,
• wherein the edge section groove comprises a first wall and an opposed second wall that extend essentially perpendicular to the first main plane, and a bottom wall between the first wall and the opposed second wall, and the insertion groove is located in one of the first wall and the opposed second wall.