It is not "lapis creator". It is "linking crate". A crate is just a wooden box. You either will get what is in it automatically, or you will just have to use it, like any other consumable.
In the end, you will have three linking hammers and five lapis pockets. Each lapis pocket gets you one lapis between lvl1 and lvl5. Not sure whether there are any rarer ones, but I doubt it.