The Master Lock 270EC Compact Door Security Bar is made of heavy duty 20-gauge steel construction that resists forced entry through both hinged and sliding doors. The compact door bar extends up to 43-1/2 in. (1.1 m) for hinged doors and up to 39 in. (1 m) for sliding doors. Door stopper bar features a flexibile handle strap for added convenience and innovative folding design for compact storage and portability. Pivoting rubber grips ensure strong hold without scratching or damaging doors and floors. Security door bar is best used for hardwood, vinyl, tile and carpeted flooring; Not intended for use on mats or rugs.