APS Premium 4" iBoard Running Boards Fit 07-19 Silverado/Sierra Double Cab EASY TO INSTALL - iBoard package includes set of 2 running boards, mounting brackets & hardware for an easy bolt-on installation 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. Rocker Panel Mount, Fit: 2007-2018 Chevy Silverado GMC Sierra Double Cab / Extended Cab & 2019 2500 HD / 3500 HD