These are Gear Shifter button covers cufflink will jump start the appearance of any shirt with the look of a French cuff. Simply slide the button covers over the button and flip them down. Wear them on your cuffs or the front of any shirt with buttons. Even looks great on a polo shirt. Approximately it will measure 1/2" diameter. Nickel plated and enamel with clip back closure. Gift boxed. A gear stick (also gearstick, gear lever, selection lever, shift stick and gear shifter) is the lever used to change gear in a vehicle, such as an automobile, with manual transmission or several common forms of automatic transmission.