Grace 302100 21" Mill-Finish Aluminum Drip Cap Drip Cap Mill-finish aluminum drip cap diverts rain and melting snow from doors and windows Used to protect door and window openings of all types including mobile homes, RVs, horse trailers, portable toilet enclosures, and more With formed ends and punched screw holes Note: measure lengths from inside the curve, as illustrated The overall length equals the illustrated inside length + 3.5 Inch Inside length = 21 Inch