Abstract: Quadrangular shelving comprising four bars with sets of four first pairs of holes, wherein the location of said sets defines different heights of the shelving for establishing the quadrangular trays, a set of quadrangular trays, wherein each tray comprises four corners and wherein each corner forms an opening and comprises a second pair of holes, the shelving comprises for each tray of the set of quadrangular trays: four plates, a pair of screws adapted to screw each plate and wherein the plate covers the opening.

Abstract: A device for connecting modular metal shelving units, comprising at least two props (1) and at least one connecting element (2), for mutual coupling of the two props (1). Each prop (1) comprises central couplings (14), first distal couplings (16) and second distal couplings (17), and each of the couplings (14,16,17) comprises a central coupling (11) and a first adjustment slot (12). The connecting element (2) comprises a first grouping (21) of pins (20), which can be inserted into the first distal couplings (16) of a prop (1), and a second grouping (22) of pins (20), which can be inserted into the second distal couplings (17) of another prop (1). The first adjustment slot (12) of the first distal couplings (16) is diametrically opposed to the first adjustment slots (12) of the central couplings (14) and the second distal couplings (17).