So we say, that puukko-knife is a multipurpose tool and a temporary weapon. Puukko is small, alltogether about two palm widths long, and its length is divided almost in half between the blade and the handle. The less than one finger wide and quite thin blade, is straight from the backside and curved by the edge -- so the point is single edged. The blade of puukko is naturally made of steel, grindstoned and honed sharp. As was said, the handle of the puukko is as long as the blade, sometimes a little longer but almost never shorter. It is perfectly fit to fill a man's hand. The handle of puukko is naturally made of wood, usually birch, rarely curly birch -- and at the blade side end, there is a brass mounting. Often there is another mounting at the other end of the handle. The handles made of birch bark have always two mountings and the blade tang going through the handle is riveted. Puukko always has a sheath, and the sheath hangs from the carrier's belt --without sheath, the puukko is not complete.
Sakari Pälsi, Puukko p. 29-30 OTAVA 1955 (ISBN 951-1-15699-3)