A Rocker Extrusion is available for each blade size. It has a channel for quick and easy installation of Blade LED Lights. Extrusion included end caps. Aluminum extrusion channel features durable high - impact powder coat finish and is made specifically for Putco Blade light light bars. E - BLADE LED Lights are a state of the art emergency vehicle light bar that is the next advancement in public safety lighting for emergency vehicles and first responders.