First let me say we are professional contractors and have installed thousands Kohler fixtures over the years. Usually we do not install surface mounted medicine cabinets but were asked to by this homeowner.  The exterior of the cabinet is metal with metal sides.  The front is a mirror and the inside back is also a mirror. That is a nice feature.  The interior has shelves but they are fixed.  There is space for taller bottles but the shelves do not move.  There were holes in the metal to screw in the wall framing.  In the past, the few surface mount cabinets have installed are mirrored on the exterior sides. But, this cabinet is significantly less expensive than others we have used.  All in all, it has a clean, contemporary design and is easy for anyone to install.  We would have preferred movable shelves and mirrors on the side, but this is a good value for your money and should last a long time.  We recommend.