The Master Lock Door Security Bar is made of rugged 20 gauge steel construction to resists forced entry through doors and sliding patio doors. The bar adjusts from 27-1/2 in. (70cm) - 42 in. (1.1m) for application flexibility. The pivoting ball joint assures full contact with floor, and padded foot provides sure grip without scratching. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.