Most cabinet scrapers are sheared from spring steel; hardened to Rc38-42. These scrapers are harder (Rc48-52) and hold an edge longer. The edges are carefully milled to a square; sharp 90 degree; ready for immediate use on fine work. For heavy-duty use; a hook must be burnished onto them. The prepared edges not only save you the initial effort of filing and stoning; but indicate the condition they should be in the next time you intend to put a hook on them.
The scrapers come in four thicknesses. The two thinnest; used for fine work; are 2inch x 6inch (50mm x 150mm). The two thicker ones are 2-3/8inch x 6inch (60mm x 150mm) and are for heavier stock removal; the 1mm scraper being suitable for paint removal. All come with edge guards and complete resharpening instructions.