Secured from the front. Type 304 satin-finish stainless steel. Back plate is 14‑gauge (2mm). Hook snaps down for safety if excessively loaded. Back plate 4″ W, 4″ H, 7⁄8″ D (100 x 100 x 20mm). Hook projects 1 1⁄4″ (30mm) from back plate. Furnished with tamper-resistant mounting screws.