Abstract: A positioner for positioning a partition or a divider at a predetermined position in a cabinet, such as for mounting a pair of drawers. The cabinet includes left and right side walls. A partition holder mounted on a frame holds the partition parallel to the left and right side walls. A left slider, slidingly mounted to the frame, includes a left jaw, and a right slider, slidingly mounted to the frame, includes a right jaw. The sliders are coupled such that longitudinal sliding movement of either slider moves the other slider an equal and opposite distance and such that positioning the left jaw to abut and align with the left side wall and positioning the right jaw to abut and align with the right side wall positions the partition holder at a predetermined holding position between the left and right side walls.