Universal Fit for RVs and Trailers: Designed to seamlessly replace existing window and vent knobs, this set features a 1-inch shaft and a 2-1/4-inch diameter, ensuring compatibility with most RV, trailer, and motorhome window latches. A straightforward solution for hardware upgrades or replacements. Enhanced Security and Weather Resistance: Our RV window knobs provide a secure locking mechanism that keeps vents tightly sealed against environmental elements such as dust, rain, and wind. Travel with confidence knowing that your RV is protected even in adverse weather conditions. Effortless Window and Vent Operation: Engineered for ease of use, these knobs allow for smooth operation of your RV and vents. A simple turn lets you quickly open, close, and lock your , making it perfect for on-the-go ventilation adjustments. Robust Construction for Lasting Use: Crafted from plastic and equipped with stainless steel screws, these knobs are built to resist and wear. Depend on these components for long-term reliability and performance in your RV upgrades. Complete Set for Easy Installation: providing everything you need for a hassle-free installation. Ideal for repairing or upgrading your trailer vent hardware, this set ensures a and function. Color: White Material: plastic Package Contents: 4 * knob 4 * screw Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.