Sometimes it will be necessary to prevent task chairs and stools from accidentally rolling away. For this purpose, Stabilus has developed the STAB-O-BLOC SF column with a stroke-dependent stop function. Integrated into standing task chairs, the column will hold the extended chair safely in place. In the lower seat range, the occupant will enjoy the familiar comfort of an ergonomic swivel chair. From a defined trigger point, when a load is applied, a rubber stopper will rebound from the column, reliably braking the chair. Below this point, the stopper will remain in the column.