4000 Series Nerf Bars for 1999-2013 F-250HD, F-350, F-450, F-550 SUPER DUTY CREW CAB BLACK Easy bolt-on, no-drill installation on most applications 3" round diameter tubing is custom designed for each vehicle Non-slip step pads allow easier, safer entry and exit Smooth 90deg bend offers a clean stylish look Black powder coat finish with a 5 year warranty