RobertsProfessional Fixed Blade Utility Knife for Heavy-duty Cutting is an easy to use knife designed to cut a wide variety of materials and deliver professional results. This multipurpose knife is easy to use and is an indispensable tool to tackle every project - big or small. Fixed blade to mark, score, or trim. It is lightweight yet effective for heavy duty cutting, and has a textured handle that assures a firm grip. Conveniently designed, it has an easy-open knob with bail that allows for quick blade change and a handle with room to store additional standard or heavy-duty utility blades. It uses standard replacement blades with 3 positioning slots and includes 3 blades.