Crescent chalk reels are feature rich in order to make every pro's work easier. With a one way refill valve and a quarter-turn removable top, filling the chalk reel is quick and clean. A one hand hub lock keeps the reel firmly secured and the end hook slides securely into a storage recess so it won't catch on other items in your tool bag. With a 6:1 gear ratio, retraction is fast and the compound braided line improves chalk retention for well defined lines, snap after snap.