This stainless steel cleaver is for one use: opening young coconuts.
You will learn more about young coconuts and how to open them during the 92-Day Juice Feasting Program on Day 18: Coconuts. On the Juice Feast, you can drink coconut water in place of some fruit juice, if drinking these higher-glycemic juices is appropriate for you.
Most Asian Markets carry these cleavers. I have linked this one from Amazon, which is the one we use. Make sure you get a cleaver that has a full metal handle, not the wooden covered ones. The wood will eventually loosen and render the knife useless. Our Stainless cleaver has opened tens of thousands of coconuts, and is the same as it was nearly 2 decades ago.