AGPtek Black Glass Bottle Cutter Machine Cutting Tool For Wine Bottles Easy To Use WORK PERFECTLY. Simply place your bottle on the support device, apply pressure, and rotate; heat the score over boiled water and cold water alternately bathe three times. EASY AND SIMPLE TO USE. Sturdier and easier to use than plastic models, this highly durable metal bottle cutter will have you cutting bottles perfectly in 5 easy steps. This glass bottle cutter takes a bit of time to get used to, but once you've got the hang of it, you'll be able to cut wine bottles up easily. SMOOTHLY CUTTING. The results will amaze you, clean breaks nearly every time. Even thick champagne bottles break easily and smoothly. CREATIVE AND CONVENIENT. It might even make you feel better about all that wines you're drinking and help you do your bit for the environment. Green cutter is suitable for 23CM (LONG) bottle; Black one is perfect for 16CM (SHORT) bottle.(The length is from the bottom of bottle to where you want to cut.)