APS iBoard Running Boards (Nerf Bars | Side Steps | Step Bars) for 1999-2016 Chevy Silverado/GMC Sierra Regular Cab (Excl. C/K Classic) | (Silver 4 inches) Innovative Patented iBoard Design Inspired by Smartphone Style, Deliver an Unique, Outstanding, Functional Appearance to your Vehicle. Massive 4 Inch Wide Solid One Piece Bars, Provides a Wider step area for Secure Footing. Hairline Texture Polished 6061-T6 Aircraft Aluminum Boards, the Highest Standard of Rust and Corrosion Resistance. iBoard Surface Covered with Full Length, Premium Quality UV Resistant Non-Slip Rubber Pad. Easy DIY Body Frame Mount (No Drilling Required) and custom fit for your: 1999-2016 Chevy Silverado / GMC Sierra Regular Cab (Excl. C/K Classic)