Over time ceramic coated steel screws begin to breakdown from the elements and time. You can start to see rust building within 5-7 years from these Screws and Concrete anchors at the base of the enclosure. When the screws are changed out, it strengthens the connection and creates a better aesthetic look. Typically you would change out the Screws as part of a Re-screening or changing out the patio screens! We do offer Stainless Steel screw replacements, to determine the cost of a Pool Rescreening and Screw replacement, take advantage of a Free Estimate Today.