3/4″ x 5/8″ (19 x 16 mm) roll formed 18 gauge type 304 stainless steel angle has corners heliarc welded, ground and polished smooth to a uniform satin finish. Mirror is installed on concealed hanging bracket that locks onto top and bottom of frame by tamper-proof set screws. Back plate is one piece, attached to frame with theft resistant locking device. See chart for standard sizes.