Abstract: A spacer for a glass sealed unit being characterized by an inner wall having a slit along the median line, both sides of the slit being formed by a fold having their apex adjacent to one another, two lateral walls adjacent the outer wall of the spacer forming a recess relative to the remaining lateral sides of the spacer, an interlock member for connecting two ends of two spacers at right angle, the interlock member has two legs disposed at right angle, each leg has a U-shaped cross-section, each leg penetrating inside each adjacent end of the spacers so that the base of the U-shaped cross-section lies between the lateral walls of the spacer and the free edges of the sides of the U-shaped cross-section lie outside the free edges of the folds.