Set of 4. Each easily adjusts to the width of a sliding door or the height of a window and locks securely in position. Rubber tips provide a sure grip without scratching the window or door frame. Door Bar, 1-1/2" dia. x 26-1/4" to 48"L. Set of 4 Window Security Bars, 1-1/2" dia. x 17-1/2" to 30"L, each. Steel and PVC.