1,Bicycle Bar Mount HD25 2,Bar Size:28 to 32mm 3,Hole Diameter for the Flashlight: ... 4,Weight:65g 5,Used for Bike Light Model: Bicycle Bar Mount FEREI | HD25Specifications of HD25:Bar size: 28 to 32 mmHole diameter for the ... to mount on the bar , use the prepared 2 pieces rubber washer you can adjust the tight from 28mm to 32mm hand bar . Bicycle Bar Mount HD25