25x PREMIUM Mini Utility Knife Replacement Blades Compatible with CopperMine Handheld Wire Stripper Can be used in a Mini Utility Blade High-Grade Steel Alloy Thicker Material (0.6mm vs 0.4mm) Shorter edge won't chip when cutting into copper. Trimmed tip eliminates weak points in the blade, increases longevity and durability. Lasts ten times longer than stock blades.