Frameless stainless steel mirror shall be 18-8, type-304, 20-gauge (0.9mm) stainless steel polished to a No. 8 mirror finish. Mirror available in different sizes. Mirror shall have 1/4" (6mm) return concealing 1/4" (6mm) tempered Masonite backing. Four corner countersunk holes provide flush fit of mounting screws with mirror surface.