Trail FX Brite Single Lid Toolbox from a 2010 GMC Siera. I do have the Key for the Lock. I am sure this will fit other trucks as well. It measures 69" across the top that sits on the Rails and Its 60.5" across the lower part that sits Between the rails. Very good Like NEW condition. I have no need for this so here it is up for sale for $100 obo. Text Cory @ 504-thee,one,nine