Hi my name is David Fennell from USA. This is a safety device designed to prevent falls from ladders, stairs or other elevated platforms. It is typically installed at the opening of a platform, mezzanine or other elevated area where a ladder or staircase is used for access. The gate is designed to be self-closing and self-latching, ensuring that it remains securely closed when not in use. When a person needs to pass through the gate, they must first open it using a latch or other mechanism, and then close it securely behind them. Ladder safety gate come in a variety of sizes and styles to accommodate different types of ladders and staircases.