The Johnson Hardware 1050-096 Aluminum Bottom Guide U-Channel Track has the following dimensions: Height: Approximately 5/8 inch (or about 0.625 inches)12. Width: Also approximately 5/8 inch (or about 0.625 inches)12. This floor track is designed for folding doors and is made of 6063T6 extruded aluminum with a mill-grade aluminum finish3. Its stock length is 96 inches (or 8 feet)