Rocker Panel Mount:07-16 Silverado/Sierra Extended/Double Cab (w/ 2 Half Size Rear Doors,Exclude Diesel) 4" S/S Side Step Rails Nerf Bar Running Boards Installation: Bolt-On To The Rocker Panel Style: 4" Inch Oval Style Tube + Slip-Resistant Plastic Step Pads Item Offered: 2pcs 4" Oval Stainless Steel Side Step Nerf Bars + Mounting Hardwares + Installation Instruction Material: Made from heavy duty T304 Stainless Steel Surface finish: polished