THE ALL-ROUNDER AMONG SPECIALISTS. WITH GLASS FIBRE REINFORCED PLASTIC. The SECUMAX POLYCUT is another of our small, disposable knives made of glass-fibre reinforced plastic. The larger gap between the blade and plastic means it can cut through multiple layers of material. Furthermore, with its long pointed nose you are able to cut your way through envelopes, between paper rolls and through layers of film. Its slender design also enables it to be used in tight spaces.