1/4" (6mm) x 100' (30m) x .016" thick Chrome Clad blade Designed for engineers and surveyors who prefer a 4-arm reel Subdivided line removes easily from reel Long, easy-action winding handle that locks line in any position Reel is nickel plated, 4-arm with rollers in each arm for smooth winding Open design construction aids in drying line and clearing out dirt A pair of 580 finger rings, a 579 engineers conversion rule furnished Reel available separately Blade style: E12