Jensen 490 Basic Styleline Recessed Steel Medicine Cabinet, White Mounting type: recessed with wall opening dimensions measuring 16-Inch by 21-1/2-Inch by 3-1/2-Inch Overall size 18-Inch by 24-Inch Rust-resistant, white baked-enamel interiors Easy to clean, one-piece, heavy-gauge drawn steel construction Mirror glass thickness: 1/8-Inch