If it’s precision you want, choose these OLFA® snap-off blades. They are extremely sharp to begin with, and you can snap off a dulled edge to maintain cutting precision. Use these blades for construction materials including drywall, linoleum, carpet, flooring, insulation, and roofing materials. (LB-10B, #5009) Good for applications such as flooring, drywall and roofing repair or replacement. Cuts carpeting, linoleum, drywall, roofing shingles and more. Every Professional Painter should carry these in his tool box!