Rack system comprising: - a plurality of metal profiles , one or more of the metal profiles comprising a first end, wherein the first end is disposed with a polymeric cap and is dismountably attached to an adjoining metal profile of the plurality, wherein - at least a part of the polymeric cap is disposed between the first end and a face of the adjoining metal profile wherein some of the metal profiles are arranged horizontally and some vertically, and - the first end disposed on a horizontal metal profile is configured for the dismountable attachment to a vertical metal profile , and wherein at least a part of the polymeric cap is disposed between the first end of the horizontal metal profile and the vertical metal profile , and - a coupling clip configured for dismountably attaching one of the vertical metal profiles to one of the horizontal metal profiles , wherein the vertical profiles are disposed with a plurality of apertures regularly spaced along at least one face of a vertical profile , each aperture configured for receiving the coupling clip for dismountable attachment to the first end of the horizontal profile , the coupling clip comprises a tapered member , the horizontal metal profile comprises a two stage slot having a first depth with a wider opening and a second depth having a narrower opening, wherein the first depth receives a load bearing part of the coupling clip, while the second depth receives the tapered member, and the narrower opening draws the horizontal metal profile towards the metal profile as tapered member advances into the narrower opening, the polymeric cap is compressible between the adjoining metal profiles to create a clamping tension. - a plurality of metal profiles , one or more of the metal profiles comprising a first end, wherein the first end is disposed with a polymeric cap and is dismountably attached to an adjoining metal profile of the plurality, wherein - at least a part of the polymeric cap is disposed between the first end and a face of the adjoining metal profile wherein some of the metal profiles are arranged horizontally and some vertically, and - the first end disposed on a horizontal metal profile is configured for the dismountable attachment to a vertical metal profile , and wherein at least a part of the polymeric cap is disposed between the first end of the horizontal metal profile and the vertical metal profile , and - at least a part of the polymeric cap is disposed between the first end and a face of the adjoining metal profile wherein some of the metal profiles are arranged horizontally and some vertically, and - the first end disposed on a horizontal metal profile is configured for the dismountable attachment to a vertical metal profile , and wherein at least a part of the polymeric cap is disposed between the first end of the horizontal metal profile and the vertical metal profile , - a coupling clip configured for dismountably attaching one of the vertical metal profiles to one of the horizontal metal profiles , the vertical profiles are disposed with a plurality of apertures regularly spaced along at least one face of a vertical profile , each aperture configured for receiving the coupling clip for dismountable attachment to the first end of the horizontal profile , the coupling clip comprises a tapered member , the horizontal metal profile comprises a two stage slot having a first depth with a wider opening and a second depth having a narrower opening, wherein the first depth receives a load bearing part of the coupling clip, while the second depth receives the tapered member, and the narrower opening draws the horizontal metal profile towards the metal profile as tapered member advances into the narrower opening, the polymeric cap is compressible between the adjoining metal profiles to create a clamping tension. <EOS>