RetraxPRO Retractable Truck Bed Tonneau Cover | 40373 | fits Ford F-150 Super Crew & Super Cab (15-18) 5.6' Bed Incredibly strong and easy to use - Features industrial-strength aluminum construction and opens and closes easily with our exclusive use of sealed ball bearings Low profile design - Our front canister cover remains flush with the rolling cover Key lockable in any position - Keeps your valuable cargo secure Great for 5th wheel towing. Improves mileage by up to 10% UV Protected; No Fading, No Maintenance