The ten sharp, trapezoidal blades are suitable for the 4K5 TK 300 Insert Blade Knife and for most utility knives. They are made of high-quality SK 5 steel and have a satin finish. Even with tough materials, good cutting results are achieved. Special features10 sharp, trapezoidal blades made of high-quality SK 5 steel with a satin finishSuitable for the 4K5 TK 300 Insert Blade Knife and most utility knivesGood cutting results, even with tough materialsIncluded in delivery10 replacement blade dispenser