This is the smallest knife available on the conservation market, with a .9mm width. The M2 steel blade retracts into a standard supplied mechanical pencil handle, so it can be retracted when not in use. The blade can be extended to about 20mm to reach into recessed areas. It has a double bevel, and can be used for cutting complex fills, working under magnification, miniature bookbinding, anywhere you need to make precise small cuts. Can be resharpened and stropped. Or the blade could be dulled to use as a micro spatula. The M2 steel blade is hardened to Rc 65. Just don’t mistake it for a pencil!