1 Pair Aluminum High Profile Roof vents with 2 ea Roof gaskets and 2.25" Trim Rings ( VENT FLANGE PLACED ON EXTERIOR, HANDLE PRTRUDES TO INTERIOR) , Cutout template and install directions provided. See drawing for unit size Top lid bi-directional with action moved by handle from bottom Two pieces on underside are of plastic that support pivot action, viewable in bottom image 2- trim ring accommodates roof thickness up to 2". Flange width of 2" . Trim ring accepts into oval cavity on bottom side of popup. Applications designed for RV Toy Hauler UTV Vans Enclosed Trailer Food Trucks Box Trucks NOTE: Confirm drawing dimensions prior to replacing a existing model as there are various models on market! Save hassle with what you think may replace!! Designed to be placed on horse trailers, dog trailers and boxes or any other unit that requires additional air flow. Completely mechanical operation. Handle on underside allows you to position the popup vent to be bidirectional. Cover is gasket-ed to allow a tight seal. Overall width and length of flange 13.375"L x 7.75"w from bottom of flange to cover closed 2.40", 4" open height with cover open from flange to lid edge. 1" flange allows for easy mounting Flange has 12 - 3/16" mounting holes for easy application (screws not included) Includes (2) 1/8" neoprene gasket 2- trim ring accommodates roof thickness up to 2". Flange width of 2" . Trim ring accepts into oval cavity on bottom side of popup. Trim ring may need cutting to accept into wall thcikness less than 2. Dremmel tool works well for this. Cutout template provided See drawing for vent dimensions