Supergate GRY Plas Gate (Blue). The Supergate III is actually five gate styles in one. The gate can be pressure-mounted in any doorway up to 42 inches wide. It can be attached to any doorway with sockets for slip-on installation. Use those same sockets between wrought iron railings or walls and wrought iron railings. Mount the sockets again to any wall or stair railing for a swing gate. The hardware is included; all you have to do is figure out where to use it.