The Extang Encore Tonneau Cover is a smart and attractive addition to your GMC Sierra 3500. Leave your truck behind for an adventure on foot and rest easy knowing you have locking protection with hard cover security and a smooth design. Unlike other folding truck bed covers, this Extang Encore Tonneau Cover includes separate locks at the front and rear (oe tailgate lock) providing secure access from either end. Complete with an attractive matte finish which matches the bed rail cap's creates a consistent look between the truck and the truck bed cover. Each 1 inch thick reinforced TPO panel has a polypropylene core and matte black skin that repels UV light, decreasing temperatures in your truck bed. Also, Extang Tuff engineering resists dents and scratches with a powder-coated finish and rubber corners. With an installation that takes 20 minutes or less, this can be easily installed the day it arrives. Now featuring the BOLT lock one-key technology, the front panel lock can be coded to fit your ignition key. This tonneau cover is composed of three separate extra wide panels for convenient loading and unloading and when the tailgate is locked, the cover cannot be opened. If you're after access and security for your GMCSierra 3500, this Extang Encore Tonneau Cover will deliver.