Extang 42450 Full Tilt Toolbox Hinged Tonneau Cover - fits Silverado/Sierra 1500 (6 1/2 ft) 2014-18, 2500/3500HD - 2015-18 Incredible Versatility; Roll Up, Lift Up, or Lift Off! Bridges Toolbox-To-Tonneau For Perfect Fit L-Channel design also provides for rain drainage Fits Most Standard 20 in. Tool Boxes Designed To Be Removed By One Person