flat bar 7 has two offsets 7 u2032 a and 7 u2032 b at the lower end of the profile which are joined by two vertically extending side walls 7 u2032 c and 7 u2032 d and the level top 7 u2032 e of the flat bar 7 for the assembly the clothing 8 together with its base support 11 is placed on the top 7 u2032 e of flat bar 7 wherein the side walls 11 b and 11 c of base support 11 end flush with the side walls 7 u2032 c and 7 u2032 d of the profile for the flat bar 7 brackets 13 that serve as means for fastening the flat bar 7 are snapped from the side onto the profiles the brackets 13 consist of sheet metal parts or the like and have level support surfaces 13 a which fit flush against the side walls 7 u2032 c and 7 u2032 d of the profile for flat bar 7 and the base support 11 resting thereon a projection 14 projects from the supporting surface on the top and bottom side of each bracket 13 the projection 14 on the top of bracket 13 rests against the top of base support 11 or the top of projection 12 thereof while the projection 14 on the underside of bracket 13 fits against the profile offset 7 u2032 a 7 u2032 b of flat bar 7 thus the brackets 13 secure the clothing 8 with base support 11 against being detached from the flat bar 7 the brackets 13 can preferably be snapped without tools onto the base support 11 and the flat bar 7 and can also be released from these without the brackets 13 being destroyed in the process the brackets 13 of.