Weep holes are a vital component for the proper maintenance of brick structures — and an open door for mice to enter. Stainless Steel Weep Hole Covers stop mice, small snakes and other pests from entering brick structures while maintaining needed ventilation and drainage for brick buildings. Mice can fit through spaces no wider than their nose, or 0.25 inch. They flatten out and pass through tiny spaces with ease, making weep holes an easy access point in brick structures. The Weep Hole Covers are discreet, made of strong spring steel, and easy to install.