Features Computer-designed LED Halos compatible with Sierra 1500 2016-2018 A huge increase in brightness, even in direct sunlight More uniform output, upgrade from segmented factory optics Designed and assembled in the USA Overview Time for an upgrade! From the factory, the Sierra comes with a white C-shaped DRL that from certain angles can look segmented and distorted. Diode Dynamics is excited to release our HD LED Halos compatible with GMC Sierra 2016-2018 that provides a much brighter, more uniform appearance compared to the factory optics. These computer-designed LED Halos are circuit boards that align perfectly behind the factory diffusing reflector. Available in switchback and amber-only, both versions also function as an additional front turn signal for a custom, yet functional look! High output, clean appearance. The application-specific LED halos illuminate in place of the factory LED boards, with a much higher intensity. With our proprietary high-density "HDLED" technology, these modules are populated with over 700 LED chips, which are then coated by a diffusing gel, resulting in a perfectly uniform light when turned on. When it's off, the diffusing gel hides the chips, resulting in a clean, OEM appearance. Wire it up. Wiring instructions are included with your order. You will need to use the included T-tap connectors to connect the drivers to ground, parking signal, DRL, and turn signal on each side. Professional installation is recommended for this product, as the headlights must be opened. What's Included Two (2) application-specific LED Halos Two (2) waterproof drivers Two (2) input wire pigtails with T-taps Installation guide 3-year replacement warranty