Mighty Mattock
Several forges and fine-tuning later, the first Mattock was born. Rino wasn't sure if the mattocks of his old world looked like this. He heard that farmers who were tired of constantly carrying a heavy hoe and axe made this. They simply bought two tools and removed the tool heads to reattach them to the pole length they wanted.
The practise became popular, and nobody knew how mattocks got their names. All that mattered was the double usefulness of the tool. The idea spread all the way to the capital, and from that moment forth, toolsmiths sold their tool handles separately from their tool heads. The empire came up with a uniform size for poles and casting holes to refit tool heads on those poles.