Flashpoint Camera Bike Bracket Mount for 31.8mm Handlebars, Allows the Mounting of Ballheads Bike mount Size: 31.8mm / 1-1/4" Compatibility: Handlebar tube Spread (Outside Distance Between Mounts): Adjustable 2.6 to 1.8" (65mm to 45mm) - inside is 0.5" less (12mm)