Install Bolt Mounted Warning Lights On West Coast Mirror Brackets Pre-drilled For Installation Of Many Popular Warning Lights Additional Mounting Holes Can Be Drilled If Necessary Fits Mirror Brackets Up To 1-1/4" In Diameter Platform Diameter: 5-1/2", Height: 3-1/2" Aluminum Mirror Mount Bracket For Bolt-On Warning Lights Install Bolt Mounted Warning Lights On West Coast Mirror Brackets