This expandable metal barrier is a sturdy 29 pounds, made from heavy duty steel in a highly visible yellow and black. This makes it especially useful for industrial environments like warehouses, loading docks, factories, and other high hazard areas. Its primary benefit is an expanding design to fill doorways and hallways of any size, fully extending to lengths of 11.5 feet or 16 feet and rising to a height of 37 inches. 2 wall attachments are included for easy installation and immediate use.