The OLFA® 18 mm heavy duty silver solid blade is manufactured from high quality Japanese tool steel. These professional blades deliver durable, lasting performance. Each blade is precision honed for unparalleled sharpness and edge retention. Fully extend the heavy duty silver solid blade for cutting through thicker materials such as foam board and insulation. Use OLFA® heavy duty silver solid blades to deliver accuracy and reliability when cutting thicker materials such as insulation, foam board and more.