The 'KING' of wine bottle brushes. 1) Slide the brush to the bottom of the bottle 2) Press down on the handle to bend the brush into shape 3) Rotate by key handle as you move brush up and down 4) When finished, pull up. It will straighten itself as it is pulled out. A great investment if you clean many bottles. For 750 ml (fifth) wine bottles only. Does not work on smaller wine bottles or beer bottles.