The bottle cutter machine can cut bottles from 1.7" to 3.8". One blade lasts over 200 cuts. Easy to adjust the cutting length and diameter. You can cut both from the top or the bottom of the bottles and mason jars. Cutting blade can cut 2-8mm thickness for glass bottles. FIT FOR ROUND BOTTLES: This glass bottle cutter can cut all round bottles such as wine bottles, beer bottles, brandy bottles, whisky bottles, Vodka, Tapered, Champagne, Captain Morgan, Perrier, Pellegrino, Patron, Growler, Grand Marnier, Firestone, etc. INSTRUCTION: Firstly, adjust size of cutter and put glass bottle in the cutter at an appropriate height. Secondly, rotate nuts to fix cutter stably. Thirdly, rotate bottle to cut a line. Then flush the cutting line with cold and hot water alternately, till the glass bottle is separated. Finally polish the cutting section with sandpaper. APPLICATION: This glass scoring machine is easy to use and can help you make many creative projects like party candles and DIY vases. And it can help you to recycle the bottles.