Rakers just supply security when they are supported and footed effectively; single-tube rakers alone do not normally give this and need to be braced to prevent buckling. https://5luklacgimx5zahy4exbum2qtqrpk6m47kevancmeinwn4efl7ba.cdn.ampproject.org/c/postheaven.net%2Fselfchina1%2Frubbish-chutes-for-scaffolding-maintaining-construction-sites-tidy