Abstract: A fencing system has at least two engaging elements, two rails extending along respective upper and lower rail axes with a generally hollow rectangular or four-sided cross-section. The rails have a horizontal top wall between first and second vertical rail sidewalls that depend downwardly to define an internal cavity. At least two attachment legs extend inwardly towards each other from the sidewalls. Vertical picket posts extend between through holes in the upper and lower horizontal rails. The picket post includes multiple grooves. The grooves receive the posts without penetration into any internal cavities of the upper and lower rail, and the posts are forced inwardly into the grooves by elastic memory in the sidewalls, the posts within grooves not being in locked engagement with the grooves, but held in place by the force of the elastic memory, the posts withdrawable from the grooves by overcoming the elastic force.

Abstract: A fencing system has at least two engaging elements, two rails extending along respective upper and lower rail axes with a generally hollow rectangular or four-sided cross-section. The rails have a horizontal top wall between first and second vertical rail sidewalls that depend downwardly to define an internal cavity. At least two attachment legs extend inwardly towards each other from the sidewalls. Vertical picket posts extend between through holes in the upper and lower horizontal rails. The picket post includes multiple grooves. The grooves receive the posts without penetration into any internal cavities of the upper and lower rail, and the posts are forced inwardly into the grooves by elastic memory in the sidewalls, the posts within grooves not being in locked engagement with the grooves, but held in place by the force of the elastic memory, the posts withdrawable from the grooves by overcoming the elastic force.