Felo 0715750745 2.5mm & 3mm Hex Reversible Blade, 4-7/16-Inch long, 280 Series Reversible blades made of Chrome Molybdenum-Vanadium steel with black tips for precision fit Performance benchmarks exceeding industry standards by up to 100% Made on 4mm stock for replacements in reversible precision sets Made in Germany Lifetime warranty - we will replace it free of charge