These replacement 18mm, 8-point snap off blades are designed for use with the Heavy-Duty Utility Knife NSN 5110-01-621-5256. Each blade measures .5mm x 18mm x 100mm (.019" x .708" x 3.93") and comes in a pack of ten. Refill Replacement Snap-Off Blades for NSN6215252 & 6215256
12 - Replacement 10 Pack Blades per Box