OLFA Replacement Knife Blades for SK-4 & UTC-1 - 10 Blades

For sharpness that lasts and works on a variety of materials, including cardboard, foam, layers of paper, and tape the SKB-2 Dual-Edge Safety Blade is your go to. It works with the UTC-1 Utility Knife and SK-4 and SK-9 Safety Knives from OLFA.