The Toro electric trimmer replacement spool with .065-inch-by-30-foot line is pre-wound and requires no tools for installation. Just snap it into place on the Toro 51256, 51301, 51302, 51303, 51304, 51305, 51307, 51308, 51309, 51324, 51326, 51331, 51332, 51333, 51334, 51335, 51350, 51353, 51443, 51444, 51445, 51446, and 51465 trimmers and start using the 10 feet of spool length.