American Specialties' 18 in. x 24 in. Frameless Stainless-Steel Mirror w/ Masonite Backing features four 7/32 in. diameter mounting holes for surface installation and a 5/16 in. return to the wall around the perimeter. The stainless-steel construction provides a practical alternative to glass mirrors in commercial settings where durability and resistance to damage are important considerations. For ADA-compliant installations, the manufacturer specifies positioning the bottom edge of the reflecting surface no higher than 40 in. above the finished floor. Mounting hardware is supplied by the installer to suit the specific wall conditions.