Leg for a piece furniture with a telescopically movable portion

A leg for a piece of furniture with a telescopically movable portion for adjusting the height of the piece of furniture and comprising an upper leg portion comprising a tube, a lower leg portion provided with a base adapted to rest on a floor, said lower leg portion being inserted into and being telescopically movable relative to the upper leg portion and having a cross-section substantially corresponding to a clear in the upper leg portion apart from a groove extending in a longitudinal direction, and fixing means engaging a hole in the tube wall in the upper leg portion and cooperating with the lower leg portion in the groove, said fixing means functioning to secure the lower leg portion at a predetermined level relative to the upper leg portion, the improvement wherein the groove in the lower leg portion is undercut, in which undercut portion the fixing means are slidably arranged, the fixing means being a locking mechanism which is movable step-by-step in the hollow space defined by the groove and an interior wall of the upper leg portion, and comprising a two-part expansion device with an expansion screw which functions to force the two parts apart to operationally solely engage the groove, the fixing means comprising a protrusion which extends through the hole through which the protrusion is introduced and fixated relative thereto from the inside of an upper wall portion and which protrusion has a bore through which the screw provided with an internal hexagon is accessible.