A blade for a cutter for a wood reducing machine, said blade being of a star like three-horn cross-sectional shape, whereby the tips of the horns form cutting edges each comprising two plane blade surfaces. Each two blade surfaces and the plane connecting surface positioned between said two blade surfaces form a Z-shaped broken line in the cross section of the blade. This shape of the blade provides for an easy fastening of the blade in a fastening socket by means of one of the horns of said blade.
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