STANLEY CUTTER KNIFE WITH HANDLE CLASSIC 99 PART NO. 10-099 HEAVY DUTY METAL BODY The fixed or folding blade utility knife is popular for both indoor and outdoor use. One of the most popular types of workplace utility knife is the retractable or folding utility knife (also known as a Stanley knife, box cutter, X-Acto knife, or by various other names). These types of utility knives are designed as multi-purpose cutting toolsfor use in a variety of trades and crafts BLADES: Utility knife, safety knife, NT Cutter knife blades and more. NT offers quality blades for just about any cutting job imaginable. NT was the first to introduce the now famous snap-off blades with utility knives to the market, and since then NT blades have been loved and used all over the world. Specialized blades also exist for cutting string, linoleum, and other materials. Another style is a snap-off utility knife that contains a long, segmented blade that slides out from it. As the endmost edge becomes dull, it can be broken off the remaining blade, exposing the next section, which is sharp and ready for use.