This kit creates a full size rack that sits above your GMC Sierra Pick-Up Truck 1987+ truck bed. This Slimline II cargo carrying rack kit contains the Slimline II tray (1475mm x 1358mm), 2 Tracks, and 4 Pick-Up Truck Bed Universal Legs that fit into the Tracks.Drilling may be required for installation. All Front Runner Rack Kits contain installation instructions as well as all the components needed to mount the Slimline II Tray to your vehicle.All Front Runner Racks are backed by a Limited Lifetime Warranty*Drilling may be required to mount the track to the bed of your truck. See the track and leg installation instructions in the INSTALL tab for further details.