Glass display cases manufacturers are now using ingenuous framing systems to get the metal shelf supports to slide all the way up and down. It makes it easy to adjust your selves and to place them in a configuration that allows for maximum displaying. When objects to be displayed are small you may even decide to add up some additional tempered glass shelves. In as long as the showcase does not get overcrowded or overloaded you end with a very flexible way to showcase your items. The addition of stands and risers on the glass shelving may also make your display more interesting and highlight your favorite pieces.