12"×30"×5" 18"×30"×5" 20"×30"×5" Key BenefitsSturdy anodized aluminum construction (Black finish) to prevent rust Patented slide shelf system (slide Edge) with smooth sidewalls for easy adjustment to meet your needs Shock-absorbing strip to minimize shock and noise Adjustable-hinge door opens to 170º and clip fastening for easy installation Standard Feature(s)Distinctive mirrored interior providing several possible viewing angles Many potential module combinations (medecine cabinets, mirrors, wall fixtures sconces and shelving) to help you create a customized unit Reversible cabinet opens from left or right to meet your installation needs Three high-quality glass shelves 8 mm (5/16 in.) thick