When you need a tough blade you can rely on, choose OLFA 18mm Heavy-Duty Silver Snap-Off Blades. Expertly honed premium Japanese carbon tool steel provides durability and a resilient sharp edge. Use these durable blades to power through gritty cutting projects from beginning to end. Each razor-sharp blade offers eight (8) segments designed to snap off when you need a new fresh cutting edge. The segment line is deep and smooth for a clean snap. OLFA blades offer a universal fit and work with most 18mm snap handles. Blades are packed in a convenient carrying case for easy storage and portability. Premium Japanese carbon steel. Eight (8) segments per blade. Fits most 18mm snap knives