The Stanley Retractable Utility Knife Combo contains the perfect tools for cutting cardboard, plasterboard, plastic sheeting, leather and much more. These knives feature an intergrated string cutter that can be used even when the blade is retracted. Store up to 5 blades in the swing-out compartment in the handle for quick, easy changes without the need for a screwdriver. They are compact for easy transportation, and handy to keep around the home, office, garage or workshop.