Installation: Our product comes with an Allen Keys Screws Set,which is and disassemble,and is interchangeable. Our detachable knobs provide full for your converter,keep it tidy,and therefore extend its service life. About Size: Approx.2.0x2.0x1.9cm/0.78x0.78x0.74inches,each set contains 4 pieces effect pedal caps,and 1 piece wrench. This dome knobs cap is metal,bronze-coloured,strong and anti-agings,anti-rust and. Appearance: Classical brass knobs appearance,with texture,and you can easily use the adjuster when you are playing.