Abstract: A retainer for releasable attachment of an insertable bar, strip, or the like to a support comprises a supporting channel mountable on the support, engageable in the supporting channel a retaining rail, in which the insertable bar, strip, or the like is detachably secured, and a first means for releasable attachment of the retaining rail to the supporting channel provided in the supporting channel. The retaining rail has two longitudinal flanges whose free edges have directed inwardly a plurality of protruding members with which the insertable bar, strip, or the like is held in the retaining rail.

Abstract: A grid designed for use as a runner or a doormat comprises a multiplicity of parallel profiled bars, preferably of plastic, having a generally U-shaped cross-section with two upstanding flanges interconnected at their lower ends by a horizontal web. In certain embodiments each flange has an inverted-Y profile with one arm joined to the web and the other arm diverging therefrom, the two arms defining between them an undercut, downwardly open longitudinal groove which in the case of at least one flange has a cross-section in the shape of an upwardly pointed arrowhead facilitating the introduction, from below, of a substantially complementarily shaped upstanding rib of a connecting member of much shallower U-profile linking a pair of adjoining bars to each other. The underside of the connecting member is either flush with that of the bars or at a slightly lower level.