The Härmä Knife is based on the Visapää 1 model, which was designed by Iisakki Järvenpää himself at the end of the 19th century. Back then the Visapää 1 was a very popular knife. Later on the development work continued, the model becoming more and more decorative and eventually reaching the form of the Double Sheath Härmä Knife, the Helahoito set, which today has an immortal reputation. By returning to the roots was formed this Single Sheath Härmä Knife. The knife itself is exactly similar as the bigger knife in the Helahoito set. The difference is in the sheaths: the one of the single sheath model is simple without any decorations. It's made of light coloured vegetable tanned cow hide, and the only decoration is so called stave or a metal hoop around the upper part of the sheath, into which is attached the belt loop. Stave is made of the same material as the knife's ferrules, brass. There's a matching traditional costume belt, "Helavyö". The model looks simple and graceful, but it's very difficult to produce. The making of ferrules require numerous phases, like the handle finishing as well. Clear-cut lines are not only beautiful but also merciless for the one shaping the product. The blade is 10 cm polished carbon steel, thus the traditional model serves also as utility knife. For a long time this model has been the knife used by some military detachments. Because of its outstanding properties it requires also some care: after each use the carbon steel blade has to be cleaned, dried, and oiled with some cooking oil, for example. The blade is extremely sharp and it's also easy to sharpen by oneself with a grindstone.
Hiiliterästerissä on toimitettaessa suojaöljy, joka on ehdottomasti puhdistettava pois ennen elintarvikkeiden kanssa käyttöä. Puukko on aina käytön jälkeen puhdistettava ja kuivattava ja mielellään öljyttävä. Jos puukko jää märkänä tuppeen, se mustuu ja saattaa ruostua. Mikäli käytät puukkoa elintarvikkeisiin, öljyä terä jatkossa esim. rypsi- tai auringonkukkaöljyllä. Oliiviöljyn happoisuus saattaa tummentaa terää.
Keittiö- ja kalaveitset sekä riistapuukko ovat ruostumatonta terästä, joka ei vaadi öljyämistä. Ruostumattomassa terässä lukee etsattuna teksti "stainless steel".
Carbon steel blade is corrosion protected with oil. The oil must be carefully removed before any use with grocery. Blade must be cleaned and dried after every use. We recommend using oil for corrosion protection. If the knife is left wet inside the sheath, it will get black markings and even rust. If you use knife with foodstuff, use eatable oil for example sunflower or rapeseed oil. Olive oil may be too acidic and affect marks on blade.
The kitchen and fish knives as well as the Game knife are made of stainless steel, which does not require oiling.