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The IRWIN 25120668 is a 5-pack of bi-metal utility knife blades designed for heavy-duty cutting tasks in trade and industrial applications. Each blade combines a hardened steel cutting edge with a flexible steel backing, a construction method that resists shattering under stress and extends usable blade life compared to standard single-alloy blades. These blades fit standard utility knives and are a practical consumable for electricians, plumbers, HVAC technicians, and general contractors who rely on sharp, reliable cutting tools throughout the workday.
These bi-metal blades are suited for cutting insulation, housewrap, drywall tape, rope, cardboard, and other common job-site materials. The flexible backing reduces snap-break failures that occur when a blade is flexed under load, making them a dependable choice in environments where blade control matters. Supplied in a 5-pack, they are well-suited for service vans, tool pouches, and job-site kits where frequent blade changes are expected.
Designed as a standard replacement blade for utility knives that accept conventional trapezoidal utility blades, as commonly used across HVAC, electrical, plumbing, and general construction trades.
Blade replacement should be performed by a qualified tradesperson following the knife manufacturer's blade-change procedure. Retract or unload the knife before swapping blades to prevent accidental cuts. Dispose of used blades in a designated sharps container or blade disposal case in compliance with applicable jobsite safety requirements. Never force a blade into a handle that does not accept the blade profile.
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