Affordable & Easy to Install. Fastest way for you to get Window Shade on your RV!,Simply Shade is the first window awning designed for DIY Installation. No need to custom order your RV Winnow Awning.,Simply Shade Window Awning Package includes awning rail, arms, roller assembly and fabric along with all the necessary mounting hardware and DIY Installation Instructions. Made with White Vinyl Fabric (12 oz.), matching white arms, castings, awning rail & components.,Size listed is the Arm Center to Arm Center Measurement. Window Frame Outside Width Measurement Guide: 20" to 30"=3' (36") Simply Shade 30" to 26"=3.5' (42") Simply Shade 36" to 42"=4' (48") Simply Shade: 42" to 48"=4.5' (54") Simply Shade 48" to 54"=5' (60") Simply Shade 54" to 60"=5.5' (66") Simply Shade 60" to 66"=6'' (72") Simply Shade. Fits windows with a Window Frame Outside Height Measurement of 36" or Less. Awning Extension for all lengths=28",Spring Tension keeps the fabric taught when extended and keeps the awning closed when retracted. Simple Install: attaches using a standard awning rail (included), each arm is attached at the bottom with 3 screws through the bottom support and pivot bracket. When extended the awning is held in place with the window awning strap & catch (included).