A quick fastening system which is designed for releasably fastening a telescopic pull-out to a side grid, preferably a side grid for furniture, including ovens, technical cabinets and computer racks, wherein the quick fastening system comprises a) a telescopic pull-out having a stationary rail element and at least one rail element mounted for movement relative to the stationary rail element, b) a side grid comprising at least one first vertical grid bar, a second vertical grid bar spaced therefrom and located substantially parallel thereto, and at least one horizontal grid bar extending substantially perpendicular to the vertical grid bars (2a, 2b) and connecting them, wherein the horizontal grid bar comprises at least one angled end section which is connected to the first vertical grid bar, extends out of the plane spanned by the two vertical grid bars (2a, 2b) and merges at an angle into a horizontal section of the horizontal grid bar which extends to the second vertical grid bar, c) a quick-fastening element comprising - a fastening plate for fastening the quick-fastening element to a surface of the stationary rail element of the telescopic pull-out, - a support portion extending substantially perpendicular to the mounting plate and comprising a support surface for abutting and supporting the quick-fastening element on the horizontal grid bar in a direction parallel to the vertical grid bars (2a, 2b), - a securing tab comprising a support surface for abutting and supporting the quick-fastening element on the first vertical grid bar of the side grid in a direction perpendicular to the plane spanned by the two vertical grid bars (2a, 2b), - a spring element which forms a resilient couplling between the fastening plate and the securing tab, wherein the securing tab is resiliently pivotable about an axis perpendicular to the fastening plate. a) a telescopic pull-out having a stationary rail element and at least one rail element mounted for movement relative to the stationary rail element, b) a side grid comprising at least one first vertical grid bar, a second vertical grid bar spaced therefrom and located substantially parallel thereto, and at least one horizontal grid bar extending substantially perpendicular to the vertical grid bars (2a, 2b) and connecting them, wherein the horizontal grid bar comprises at least one angled end section which is connected to the first vertical grid bar, extends out of the plane spanned by the two vertical grid bars (2a, 2b) and merges at an angle into a horizontal section of the horizontal grid bar which extends to the second vertical grid bar, c) a quick-fastening element comprising - a fastening plate for fastening the quick-fastening element to a surface of the stationary rail element of the telescopic pull-out, - a support portion extending substantially perpendicular to the mounting plate and comprising a support surface for abutting and supporting the quick-fastening element on the horizontal grid bar in a direction parallel to the vertical grid bars (2a, 2b), - a securing tab comprising a support surface for abutting and supporting the quick-fastening element on the first vertical grid bar of the side grid in a direction perpendicular to the plane spanned by the two vertical grid bars (2a, 2b), - a spring element which forms a resilient couplling between the fastening plate and the securing tab, wherein the securing tab is resiliently pivotable about an axis perpendicular to the fastening plate. - a fastening plate for fastening the quick-fastening element to a surface of the stationary rail element of the telescopic pull-out, - a support portion extending substantially perpendicular to the mounting plate and comprising a support surface for abutting and supporting the quick-fastening element on the horizontal grid bar in a direction parallel to the vertical grid bars (2a, 2b), - a securing tab comprising a support surface for abutting and supporting the quick-fastening element on the first vertical grid bar of the side grid in a direction perpendicular to the plane spanned by the two vertical grid bars (2a, 2b), - a spring element which forms a resilient couplling between the fastening plate and the securing tab, wherein the securing tab is resiliently pivotable about an axis perpendicular to the fastening plate.