OLFA 18mm Heavy-Duty Ultra-Sharp, Snap Off Replacement Blades, 50 Blades (400 segments) LBB-50B - Snap-Off Utility Knife Replacement Blades, 25% Sharper than Silver, Fits most 18mm Utility Knife
OLFA 9069 LBB-50B 18mm UltraSharp Black Snap-Off Heavy-Duty Blade, 50-Pack