How To Install Screw the inner swivel rod to the desired length, 2-5cm longer than the actual shortest distance on both sides of the object, tilt the rod slightly between the sides of the object so that the rod is gently parallel to the ground, and finally supported by the spring. Use Effect The friction of the wall and the elongation of the rod will affect the use, and the greater the friction with the wall, the shorter the extension length of the rod, and the better the use effect. Recommended Length For best performance, recommended length is 15.7 to 24 inches. Adjustable and Non-Slip—— this tension rod is designed with an extendable function, you can adjust the length of the curtain rod according to your needs, and the anti-slip rubber at both ends enhances friction, making it more convenient to fix.Safety Performance—— the door security bar can help stop your doors and windows from sliding, effectively preventing intruders from entering, and the sliding glass door security bar also preserving children from being injured when opening the doors or windows out of curiosity, increasing the sense of security and the lock door security bar design is portable and compact making it easy to store and ideal for travel, provide convenience in life.