For cutting metals, especially aluminum and softer alloys, fiberglass, Plexiglas and insulating materials. Dimensions:2 1/4" x 7/64" x 1/64" (57 x 2,9 x 0,6 mm). Tooth pitch 3/64"(1,06 mm). Teeth are alternately set and sharpened. Proxxon tools come with a 2 year factory warranty.