HIgh quality professional glass bottle cutter tool kit machine wine

HIgh quality professional glass bottle cutter tool  machine wine

using thermal expansion and contraction to crack glass:

1. Turn the bottle around on the cutting table and mark the mark (note: only one circle, do not repeat the mark)
2. Put two rubber rings on both sides of the line (note: the interval is about 1 cm).
3. First pour boiling water (about 30 seconds), then quickly pour cold water (about 10 seconds). (Note: try not to pour boiling water outside the rubber ring)
4. Open the bottle with your hands (if you may fall off by yourself, please be careful. If you can't break it, please repeat the third step).