Features 1、Made of high quality aluminium material, not easy to rust and durable in use. 2、Spring and support bar provide additional protection against wind damage. 3、The window opener automatically opens and closes as the temperature changes. 4、Universal, easy to install and use, suitable for any blind window, easy to use. 5、Easy fitting by clamps or screws provided, no batteries or electricity required. Specifications Condition: 100% Brand New Item Type: Window Opener Material: Aluminium Opening Force: 25kg / 55lb Operation Area: Start at 17-25℃ (63-78℉) Maximum Open: Full at 30-32℃ (86-90℉) Closing Force: 15kg / 33lb via heavy duty spring Support Bar Length: Approx. 34cm / 13.4in Spring Fixing Tool Size: Approx. 14 x 5 cm / 5.5 x 2 in Weight: Approx. 343g / 12.1oz Package List 1 x Support Bar 1 x Spring Fixing Tool 4 x Slotted Screw 2 x Small Cross Nail 4 x TD Screws 2 x Small Screw 4 x Large Round Fixed Ring 2 x Small Round Fixed Ring 2 x Round Iron Ring 1 x Instruction Manual