Retro Chrome Motorcycle Head Light Triumph BSA Cafe Racer Bobber Chopper Vintage 5 1/2" Headlight for your motorcycle. Compact design is great for old school applications or for dual headlight conversions. Can be used as driving, passing lights as well.To fit American or metric choppers and bobbers, or any custom applications. Top quality metal housing. 12 volt Hi/Low bulb. Classic bottom mount bates style in black finish for old school look! Thread Size: 10mm. Measurements: 5.5"wide, 4" deep. Lens diameter: 4".