Suitable for window edges larger than 1.1 cm, and fits most RV windows and vent systems. The knob size is 5.7x3.4x2.5cm, suitable for a variety of RV windows and ventilation systems, ensuring wide adaptability. Made of plastic composite material, it has high strength and durability to withstand long-term use. The knob surface design is easy to grip, providing a better operating feel, and can be easily adjusted even in wet conditions. Matching screws ensure quick installation and firm fixation, saving users installation time., Manufacturer: SG Store