40 pcs Utility Knife Cutter Blades 7 sections 18mm Snap Off Razor Refill Blades $10.29 2 pcs Carton Box Cutter Retractable Razor Blade Pocket Compact Utility Knife $4.79 2 Pack - Carton Box Cutter Retractable Razor Blade Pocket Compact Utility Knife (2/Pack) - B111 $6.69 Utility Cutter 18mm Stainless Steel Blade Self Loading Plus 3 Replacement Blades Shippers Carpenter Knife Box Opener $6.69 $6.59 8 pcs Utility Knife Cutter Blades 7 sections 18mm Snap Off Razor Refill Blades $4.59 Staniley Heavy-Duty Utility Knife Replacement Blades, Long lasting Blade Life 10-Count $8.29