Live alone and need more sense of safety? Greatim's new Security Bar fits most hinged door. It's extension lock and pivoting ball joint make it easy to adjust the lentgh and position of the bar. Unscrew the extension lock and adjust the 360o rotating ball joint to the right length and angle that fits your door. Props it under your door knob. The base grips the floor firmly and it stops invasion from the outside. It is a simple but effective way to protect yourself.