Prime-Line MP1579 Sliding Door Repair Track is designed to restore smooth operation to worn or damaged sliding track systems on aluminum doors. This replacement door track cap slips over existing damaged tracks, providing a simple and effective solution to prolong the life of your sliding door. Built to last, the patio track is made of high-quality stainless steel for maximum durability and rust resistance, ensuring long-term performance. Simply prep the existing door tracks, apply a thin bead of silicone glue, and snap the repair track into place using a rubber mallet and block of wood for a secure fit. Each replacement sliding track measures 3/16 inch x 96 inch x 1/4 inch and comes in a convenient 2-pack. For further dimensional information, please see the line drawing before purchasing.