??? Attaches with a 1-1/4??? chrome p-clamp to 1-1/4??? handlebars??? A black 2??? arm which features a hand tightening knob, attaches to the diamond ball connected to the back of the device with 2 screws and nylon stop nuts??? This allows you to articulate and adjust to the spot most convenient??? All parts except for the 1??? p-clamp and ball can be easily removed for safe storage