Versatility - Use for box cutter razor blade, utility knife blade .25mm Thickness Standard Size SK5 Steel Single Edge Razor Blade Sharp blade edge for cutting through cardboard, leather, rope, vinyl, paper, foam, wood Storage Dispenser - Quick access dispenser with safety blade edge cover Edward Tools Utility Razor Blades 10 Pack with Dispenser is a pack of 10 durable razor blades for cutting vinyl, cardboard, leather, paper, foam, wood and more. Made of SK5 steel and .25mm thick these are made to fit all standard utility knives and blades. The storage dispenser allows for quick blade access and covers the blades for safety.