4" OVAL CHROME SIDE STEP NERF BARS running boards 99-15 F250 F350 SUPER/EXT CAB Application: 1999-2015 Ford F250 / F350 / F450 / F550 Super Duty Super ( Extended ) Cab Models ( Fit Models With 2 Full Size Front Doors & Half Size Back Door ) 4" Inch Side Step Nerf Bars Heavy Duty T-304 Full Stainless Steel With 5 years Warranty Against Rust And Corrosion, Oval Design Provides A More Secure Area color:Chrome 465 lbs. Weight rating. Bar is positioned high and tight for a better fit and cleaner look. Professional installation is recommended