Sunoptics FK R2020 W25.500 L25.500 HEIGHT3  2-Feet by 2-Feet Flashing Kit with 3-Inch Vertical Curb Weather-proof galvanized steel construction with welded corners Designed for use with a 3 in. vertical curb Two end saddles wrap around roof curb on 3 sides Ten 9 inch long step shingles are included to allow for adjustable length up to 37-1/2 inch Fasteners are required for installation (sold separately)