The Dewalt Chalk Line Set features a Line Lock that holds the line tight while snapping for superior tension. The TOUGHSERIES Bold Braided Line is designed for construction professionals and offers high visibility and a thick line. The 6:1 Planetary Gear System prevents line jams for long-lasting durability, and the BACK ACCESS DOOR allows for quick and easy string replacement. The flush Handle Design ensures convenient storage and keeps the line from unwinding. The TOUGHSERIES chalk reel is built to last, making it easy to replace the line and continue using the same reel for years to come.