Fit 99-13 Silverado/Sierra 1500/2500/3500/1500 HD/2500 HD/3500 HD EXT Extended Cab (w/ 2 Half Size Suicide Style Rear Doors,Exclude SS Model)&nbsp;4" Oval S/S Side Step Rails Nerf Bar Running Boards Installation: Bolt-on To The Frame (Body) 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