Instructions For Hinged Doors: Adjust the length of the bar by pressing the gold button and slightly rotating either tube. Snap the Y-shaped head of the safety bar under the door handle. Slide the bottom rubber foot in towards the door until it's snug and tight. Take care to keep the rubber head free of gaps in the ground. Instructions For Sliding Doors & Windows: Adjust the length of the bar by rotating either tube. Align the bottom with the sliding door/window frame. Attach the rubber caps to the top. Press the security bar down until it is secure. You will receive: 1 piece Adjustable door anti-theft bar door support