These Faithfull general-purpose heavy-duty blades are made from quality SK5 steel in Sheffield. They fit most leading brand knives and are suitable for trade use. The blades are designed to cut carpet, vinyl, cardboard, canvas, leather and some softer plastics. The pack of 10 blades comes in a plastic dispenser and the pack of 100 is supplied in a cardboard storage box.Blade Size: 19 x 60mm. Thickness: 0.63mm.