This Olfa® 8-segment 18mm snap-off blade is made from high-quality carbon tool steel. Micro-honed blade provides superior initial sharpness and edge retention. Exact 59° front-edge angle optimizes cutting power and minimizes blade breakage. These heavy-duty blades can be used on construction materials such as drywall, linoleum, carpet, flooring, insulation, flexible conduit, roofing, and more.