The Symmetry Heavy Glass Bypass Slider features two sliding panels that roll on the inside of two heavy-duty stainless-steel tubes. This configuration creates a footprint at the bottom of the unit of only 2-5/16″ (significantly less than conventional doors with the panels outboard of the header) allowing the unit to be installed on tubs and showers with narrow curbs. Additionally, Symmetry provides easy installation by eliminating wall jambs and adding idle rollers in place of a traditional curb.