Lufkin CL100B Crescent Blue Chalk & Reel, 100 FeetA one hand hub lock keeps the reel firmly secured and the end hook slides securely into a storage recess so it wont catch on other items in your tool bag. Highlights: Single hand hub lock allows user to stop line in place and snap lines with only one hand One way refill valve and a quarter turn removable top, filling the chalk reel is quick and clean One hand hub lock keeps the reel firmly secured and the end hook slides securely into a storage recess