This increases hardness (Rc 75-80) without increasing brittleness, which is measurably harder than high speed steel. The Nitro Heavy-Duty Construction Reamers have a Ferritic Nitro Carburizing surface treatment, which gives a hard, protective layer to the reamer.
SET 4,Solid Carbide Bur Set Single Cut Manufactured from Tungsten Carbide, they are primarily used to remove burrs (the small flakes of metal) that often remain on the workpiece after the machining process. Burs are available in standard lengths, long series (for hard to reach applications), and in miniature sizes (for use in pencil grinders)..