WS899 Caution Glass Door Sign with Circle Triangle Exclamation MarkThe WS899 Caution Glass Door Sign with Circle Triangle Exclamation Mark is part of our Warning Sign Range. Our Caution Glass Door is suitable for various Commercial Buildings, Tall office Blocks. The WS899 clearly identifies the Health & Safety throughout Commercial Buildings, Tall office Blocks. The format of the standard WS899 sign is Square and displays a Black Circle Triangle Exclamation Mark Caution Glass Door text on a Yellow Background.