Hella's Rallye 4000 Halogen Series Are The Industry Standard For Tough, Race Proven Lamps. The 4000 Is Specifically Designed For The Off-Road Racing Enthusiast And Features A Durable Metal Housing In Either Matte Black Or Chrome, And Structured Glass Lens. Heavy-Duty Mounting Base Features Knurled Knobs For Fast Lamp Adjustment. Single Lamp Unit Includes H1 55W Bulb, Protective Stone Shield And Mounting Hardware.