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In page Jasenovac concentration camp:

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The construction was originally a type of wheat sheaf knife, manufactured prior to and during World War II by the German factory Gebrüder Gräfrath from Solingen-Widdert, under the trademark "Gräwiso".[6][7][8] The upper part of the knife was made of leather, as a sort of a glove, designed to be worn with the thumb going through the hole, so that only the blade protruded from the hand. It was a curved, 12-centimetre-long (4.7 in) knife with the edge on its concave side. The knife was fastened to a bowed oval copper plate, while the plate was fastened to a thick leather bangle.[8] Its agricultural purpose was to enable field workers to cut wheat sheaves open before threshing them. The knife was fixed on the glove plate to prevent injuries and to increase work speed.[citation needed]