Features: Roof vent lets musty air, smoke, and cooking odors escape your RV or trailer and lets fresh air in. Lets you circulate air while keeping your RV locked and secure. Hand-operated metal crank makes it easy to open and close the vent from inside your RV. Eliminates the need for electrical wiring. One-piece Seamless frame is leak resistant and weather tight. Built-in screen lets air through and keeps insects out. Special polypropylene is durable and holds up to the sun. Black lid Including Mounting Screws. Specs: Fit roofs with an opening 14" wide x 14" long Fits roofs 1-1/4" to 2-1/4" thick Dimensions: 14" long x 14" wide