APS iBoard Running Boards (Nerf Bars | Side Steps | Step Bars) for 2004-2006 Toyota Tundra Double Cab Pickup 4-Door | (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 Rocker Panel Mount and custom fit for your: 2004-2006 Toyota Tundra Double Cab Pickup 4-Door