Features: High-Quality Material: security rods for windows are mainly made of quality stainless steel material and plastic, adopting electrostatic spraying of steel surfaces, window safety bars can effectively avoid rust, are strong and sturdy, and not easy to fade or break, with a smooth surface, serving you for a long time. 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 and will not break the window frame. Specifications: Material: stainless steel and plastic Color: white Size: (approx.) Length: expand from 60cm/23.62 inches to 110cm/43.31 inches Sliding Door Security Bar Diameter: 2.2 cm/ 0.87 inch Non-Slip Rubber Head Diameter: 3 cm/1.18 inch Package includes: 4 x Window Security Bars How to install: Screw the inner swivel rod to the desired length, 3-5cm 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. Warm notices: 1. Due to manual measurement, there may be slight errors in size. 2. 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. 3. For best performance, recommended length is 23.62 to 39.37 inches.