For cutting jobs that require superior sharpness, choose these OLFA UltraSharp blades. These carbon tool steel blades are double-honed for extreme sharpness. Use these blades for construction materials including drywall, linoleum, carpet, flooring, insulation, and roofing materials. Good For: Applications such as flooring, drywall and roofing repair or replacement. Cuts carpeting, linoleum, drywall, roofing shingles and more.