Sliding Door Bar, Made Of Heavy Gauge Steel For Maximum Security, Durable Aluminum Finish, Allows Door To Be Locked In Either Vented Or Closed Position, Adjusts To Fit Doors 28" To 48" Wide, Mounts On Inside Or Outside Sliders, Lock Prevents Lifting Of Bar From Outside, Easily Installed Without Cutting, Stores Neatly When Not In Use, Unique Design Allows Product To Be Merchandised In 20" x 4" Space,.