The Horseshoe Astragal seal mounts to the sill and top jamb of the door and is designed to seal where the Astragal meets the sill and head. Made for French/Double Doors, it creates a weather-tight seal between the threshold and the Astragal. 2 sets of seals to fit most profiles of Wood, Composite and PVC Astragals, and can be easily painted or stained to match the doors. Includes 2 top horseshoes, 2 bottom horseshoes, and six installation screws. Made by KS Hardware - the name you trust for all your hardware needs!