The Grace VYCORner Plastic Window Corner Flashing creates a superior flashing solution around window and door corners. They are used in conjunction with Grace Vycor Flashings, allowing for a better overall flashing around the doors and windows. Vycorner saves labor, makes installation quick and easy, and requires no special training. The Grace VYCORner Plastic Window Corner Flashing can be installed quickly and easily with a staple gun.