The Master Lock® model 270D Folding Door Security Bar is made of rugged 20-gauge steel construction to resist forced entry through doors and sliding patio doors. The Folding Door Security Bar is the only adjustable door bar on the market designed to offer both robust strength and compact storage and portability, making it convenient to take with you on the go. The quick-release design unfolds and adjusts to a variety of lengths to add an additional layer of protection to most standard doors. Comes with a limited lifetime warranty to provide peace of mind from a brand you can trust.