A coupling element includes at least one coupling member having a first end and a second end, wherein the coupling member has a flat face on a first side thereof, at least one barb extending in cantilever manner from the flat face and depending away from the first end so as to hinder or prevent the removal of the coupling element from a bore in a surface of a first article into which the coupling member has been inserted from the first end.

An adjustable desk includes four extendable legs and an open-sided adjustable frame. The open-sided adjustable frame provides an open space between two of the extendable legs such that the open-sided adjustable frame is suitable for supporting a U-shaped desktop.

A set including a first panel, a second panel and a mechanical locking device for locking the first panel to the second panel, wherein the first panel includes a first edge surface, the second panel includes a second panel surface, the first edge surface is facing the second panel surface in a locked position of the first and the second panel, the mechanical locking device includes at least one rod-shaped element at the first edge surface, at least one insertion groove at the second panel surface, the rod-shaped element is configured to be inserted into the insertion groove, the rod-shaped element extends at a first angle from the first edge surface, the insertion groove extends into the second panel surface at a second angle from the second panel surface, the mechanical locking device further including at least one locking groove.

A pivotable furniture dowel for connecting furniture parts, for example for connecting wood-based panels at right angles, includes a dowel bolt. The dowel bolt is configured such that it generates different peripheral pressure forces in a receiving drilled hole of one of the furniture parts at a predetermined angle of rotation of the furniture dowel relative to the furniture parts to be connected.