The Modern Gold Back‑to‑Back Paddle Knob is suitable for frameless shower doors made of ¼"–½" (6–12 mm) tempered glass, but it is not a structural component designed to carry or support door weight. For an 85 lb wall‑hinged shower door, the hinges—not the knob—determine load capacity. The knob is purely a handle/operating accessory and can be safely used as long as the correct heavy‑duty hinges are installed.