Replacement Blades SKB-2/5B (5 Packed Blades) These blades will fit SK-4, SK-9, and UTC Cutters Trapezoid Safety Blade Cutter Knife Dual-edge, specially designed, manufactured from high-quality carbon tool steel blade for maximum performance and durability, Superior sharpness and edge retention, ideal for general purpose use Ideal for cutting coated film, vinyl, shrink wrap, packaging, multi ply corrugated cardboard, paper, fabrics, tape, car wraps, sign-age vinyl and many more materials Blade Specification Blade Length: 72mm Blade Width: 17.5mm Thickness: 0.6mm Olfa blades are good for cutting: Cartons Packages Poster board Cardboard Corrugate Carpet Linoleum. Roofing felt Ground sheets Vinyl Resin sheet Membranes Fabrics Sheet materials Under felt Shrink wrap Bubble wrap Packaging Pallet wrapping Boxes and more Double-honed blade provides superior initial sharpness and edge retention All OLFA art blades undergo an advanced production process that results in excellent sharpness and long life. OLFA blades are designed for right hand or left hand cutting, to ensure safety only use genuine Olfa replacement blades mounted on OLFA cutters and knives