Patio door security locks must be durable above all else and be capable of withstanding extensive jiggling and weight pushed against it. Choose sliding door locks made of durable materials such as steel or aluminum. Ability to adjust lock size is important, because door sizes vary. Design of the lock is another key factor in its ability to prevent unwanted entry, and online reviews are helpful in selecting the best do it yourself lock models.
Research patio security bars sold by companies such as Mr. Goodbar to find durably made sliding door locks. The company's standard patio door lock bar is an elongated unit made of steel with an adjustable slot that extends up to 4 inches in length. Versatility is a main feature of this design style, and homeowners can position the bar at either end of an inside or outside sliding patio door. Home Depot sells low-cost security bars for sliding doors, and most models are fine for residential and commercial use.
Security gates offer more extensive patio door security, and companies such as Metalex Security Products offer numerous designs. Security gates are made out of durable metal materials and provide coverage of the entire door. This company also sells locking security gates for double patio doors, and gates that protect four doors.