This is the original GAMMON REEL® plumb line reel which was designed for use in the surveying field and comes with 6-1/2 feet or orange plumb line.
The GAMMON REEL® plumb line reel allows for simple and fast plumb bob set-up and adjustments. When you reach for your plumb bob the GAMMON REEL® plumb line reel is automatically in the palm of your hand.
When your plumb bob is not in use, the plumb line is quickly retracted in the GAMMON REEL® plumb line reel thus eliminating tangled, broken and muddy string and reducing neck burns and other plumb line accidents.
The bright red Myler® protected target also serves as a sight.
Plumb bob is not included.
Available in 3 models: 6.5ft Orange & White , 12ft. Orange & White, 12ft. Hi Viz Black & Red 
Need more information. See Gammon's Site Here