Both slider and stacker doors are excellent for use in filling large openings. These doors provide smooth ease of operation and have a tidy finish with concealed rollers. Slider and stacker doors are generally used from living or bedroom areas leading onto decks or patios. both sliding and stacker doors are great space savers. There is no clearance to take into consideration as all door movement is fitted inside the frame. There are specifically designed anti-lift locks which prevent panels from being lifted from their tracks.