The S155/W is a special blade to cut rigid foam and fiberglass insulation, cardboard, foam rubber, and similar materials up to 5 inches. The undulated blade is designed to give fast and clean cuts in materials, that normally have to cut by hand in a very time-consuming way with a box cutter or knive. Festool jigsaw blades are engineered for cutting efficiency, long life, and superior cutting results, with a universal T-shank design that fits most professional jigsaws. Festool has the right blade for any application or type of material, ensuring precise and consistent results. In order to select the right jigsaw blade for your application, think first about the type of material you want to cut, since there are blades available for wood, plastics, non-ferrous metals, steel, and special materials like fiberglass, foam, and other materials. Next decide what kind of cut you need: fine, fast, scroll, clean. This will help to decide which blade is right for you. All Festool jigsaw blades are made in Germany from high-quality materials for the best possible cutting results. Pack of 3 jigsaw blades.