Check the listing for details. 40pcs Craft Hobby Blades #21 Replacement Cutting Carving Blade for Art DIY. Condition: New. Listed at 13.01 USD. Attributes:Material: Manganese SteelTotal Length: 43.5mm / 1.71"Blade Width: 11.7mm / 0.46"Shank Width: 8.8mm / 0.35"Thickness: 0.4mm / 0.02"What Is Included:40 Pieces x Craft Knife BladesApplications & Features:--- Used to replace the blade used in craft knives, suitable for handicrafts, model making, paper cutting, and other fine crafts.--- Suitable for home DIY, art classes, carving enthusiasts, and other occasions.--- Can cut on scrapbooks, wood carvings, paper crafts, plastics, leather, and other materials.--- The hobby blades are made of high-speed steel for a sharp edge that lasts.--- The refill hobby knife comes in a mini storage case, which is a very nice way to keep and manage all the blades.Useful Tips:--- Please be safe when using.