Put your hand on the back of the knife, and draw 180 degrees counterclockwise and 180 degrees clockwise where there are protrusions on the bottle mouth. After the bottle seal is cut open, wipe the bottle mouth clean with cloth or paper towel. Then aim the screwdriver of the bottle opener at the middle of the cork and turn it clockwise vertically downward. Control the strength and don't drill through the cork. Slowly enter until almost all the augers enter the cork. Then clamp the bottle mouth with the top buckle of the bracket, clamp the bottle mouth below, and then slowly take out the cork. Don't take it out directly to prevent the sawdust from falling. Finally, slowly and completely pull out the cork.