Take Accurate Inside And Outside Measurements With The 16 Ft. Powerlock? Tape Measure. Mylar? Polyester Film Extends The Life Of The Entire Blade While The Durable Chrome High-Impact Abs Case Provides Protection. The Tru-Zero? End Hook Provides More Accurate Measurements. Plus, The Blade Locking Mechanism Holds The Tape Measure In Place So It Won'T Creep.