Your entry door has a gap along the bottom that's letting drafts, dust, and insects through — you can feel it at ankle level on a windy day. The original door sweep is worn out, compressed, or missing entirely, and a single sweep isn't closing the gap. A double sweep replacement covers the full door width with twin fins that seal against the threshold and the door face simultaneously. Double-fin aluminum sweep — creates two lines of seal along the door bottom edge, blocking airflow that single-fin sweeps let through at the corners and threshold track. Aluminum body holds up to foot traffic and seasonal temperature changes without cracking or hardening like rubber sweeps. Installs with screws — cuts to width on-site with tin snips. Fits standard metal threshold tracks. What contractors and Stocked at Crofton Lumber and Akron Lumber.