Built as a 6-panel adjustable safety gate this expandable metal barrier protects stairways doorways and play areas with widths from 34.5 to 154 in. Configurable 270 degree hinges support straight L-shaped and U-shaped layouts for hallways or hexagonal 43.3 x 41.33 x 29.13 in pens. The 16.5 x 28.5 in self-closing door includes a double-lock mechanism stays open at 90 degrees and meets Astm and Cpsia safety standards for children ages 1 to 3.