Utility Knife Replacement Blades 10 pc Razor Cutting Retractable Blade Cutter Here is a 10 piece utility knife replacement blade set. Fits folding knife and retractable utility knives. Plenty for multiple cutting tasks. Each features 4 securing holes and 2 securing notches. This allows for blade accommodation to many size variants of utility knifes. Use the one that locks the blade in nice and tight in the particular knife your using. Please see the specs above for more detail. Thanks for stopping. Please visit my slow growing store, read about me, my policies and view other items that may be of interest. Also, if you like, please add me to your saved seller list receive TDR Newsletter that I run bi-weekly be notified of new product, sales and other news. **I always have money saving volume discounts on most items** David - thediscountretailer