LENOX Tools 1991610 U-Shank carbide grit jig saw blade, 3 1/2-inch x 3/8-inch, 3-pack provides users with high performance in abrasive materials and straight, clean cuts. Cuts through tough materials that resist chip-forming, including ceramics, fiberglass, brick, and more. Uniformly applied, durable carbide grit particles on a flexible blade provide fast cuts without binding.