Some bulky or fragile goods are transported in wooden crates. Sometimes a nail extractor, but usually a crowbar is used to open them. The latter is sometimes combined with an ax and a hammer; it then becomes a crate ax.
There are several models of that composite tool. In general, it is made entirely of iron and weighs 0.4-0.8 kg. The handle continues above the ax and the hammer; he forms a crowbar there. Sometimes a drop-shaped hole is drilled in the stem or a notch in the blade of the ax to pull out long nails. [MOT]