A disposable knife made to fit glass knife holders on ultramicrotomes or specialised rotary microtomes for cutting location sections 2-15µm or trimming plastic blocks or hard speci- mens. Example applications are: Serial sectioning of the cornea, mouse brains, fish embryos, Spinal cords, Section scan- ning, Polyester film and hard materials, Trimming / block facing, Ovaries / Fish eggs, Skin