Package Content： 3 durable window and vent control knobs along with 3 stainless steel mounting screws, ensuring you have everything needed for replacements or upgrades. Universal Fit: 1-inch shaft and 2-1/4-inch diameter, these knobs are compatible with most standard window and vent mechanisms in campers and trailers, providing a secure and reliable fit. Durable Construction: The knobs are made from tough ABS plastic, while the screws are crafted from rust-resistant stainless steel, ensuring long-lasting strength and resistance to wear and tear. Easy Installation: Each knob comes with included screws, making installation quick and straightforward. Refresh your interior hardware without the need for professional assistance! Practical and Versatile: Perfect for replacing old, broken, or worn-out knobs, this set is a smart solution for refreshing your interior hardware, ensuring smooth operation and a polished look. RV Window and Vent Control Knobs Produce information Shaft Diameter:1 inch Knob Diameter:2-1/4 inches (2.25 inches) Color: White Package Quantity:3 durable window and vent control knobs along with 3 stainless steel mounting screws Universal Compatibility:1-inch shaft diameter + 2.25-inch knob diameter, compatible with most standard window and vent mechanisms in campers and trailers- Plug-and-play design, no complicated modifications required Durability: Knobs made of impact-resistant ABS plastic, suitable for bumpy vehicle environments - Stainless steel screws are rust-proof and corrosion-resistant for long-term use Easy Installation: Each knob comes with stainless steel mounting screws (no extra tools needed- Can be replaced by one person without professional assistance, saving time and cost