Utility Knife Blades Ten Pack - Box Cutter Blades Refills - 10 Heavy Duty SK5 High Carbon Steel Utility Razor Blade Replacement in Convenient Storage Box - Standard Size - Fits Most Cutters & Knives

Premium Quality: Made of high hardness chrome-molybdenum steel and high-speed steel 6542 with 68 HRC max Rockwell hardness which is double times price higher than the HSS 4341, just for the superior durability. | Wide Size Range: Different from the usual size range (6.35mm to 19mm), we are more comprehensive (2mm to 21mm) for more applications. | Easy to Use: A friendly user guide to let you get started quickly to extract the damaged bolts, nuts & screws with ease. | Rich Accessories: Including knockout pin * 1, drill adapter * 1, extractor adapter * 1, bit holder * 1 for greater versatility. | Organized Storage: A compact, heavy-duty blow mold case keeps all the extractors organized and takes your set on the go.