CenterFire 4 inch Insulation Blade

Item: CB00-1104

The CenterFire Insulation Straight Blade (Handle not included) quickly cuts through foam and fiber insulation products such as blue or pink foam board insulation. Blade fits into standard utility knife handles and most reciprocating saws. The non-serrated edge eliminates dust and debris – best tool available for cutting plasma rope. Crafted from high-quality tooling steel, these re-sharpenable carbon steel blades outlast most other blades.

Note: We recommend purchasing the shortest blade that can cut all the way through your product to avoid wandering. The 4 inch blade is ideal for 3 inch thick foam board insulation, especially those with paper or foil backing. For other products see our 3 inch Straight Blade and 7 inch Straight Blade.

MSRP: $14.95


Description & Specifications

Quickly cuts through foam and fiber insulation products like batt Insulation, Denim/Bonded Logic and fiberglass. Slightly flexible blade can be drug quickly through insulation (no need to waste time sawing!) and easily around window frames.

Pro Tip: The best way to use this blade is to drag it through your material at an angle. Unless using in a reciprocating saw, trying to saw or slice with the handle straight up may result in the blade flexing or wandering.



  • Long-lasting re-sharpenable carbon steel blade outlasts most other blades
  • Crafted from high-quality tooling steel
  • Non-serrated edge eliminates dust and debris
  • Easily cuts notches and squares around outlets, and circles in sheets
  • 15% time savings that increases to 30% when used with the MAGNUM Shut-N-Cut (1901-26-01)
  • Clean, fuzz-free, dust-free cuts even on “hard to cut” insulation like    denim and Rockwool
  • Blade fits into a standard utility knife handle as well as a Sawzall-type reciprocating saw
  • Versatility allows the blade to work with the CenterFire Insulation Knife Kit as well as other cutting tools


  • Cut through insulation FAST!
  • Insulation Batts
  • Denim/Bonded Logic
  • Polyester/Enguard/Vita Nonwovens
  • Fiberglass
  • Rockwool/Mineral Wool
  • Foam Boards (Rigid sheet foam products)
  • Poly Iso
  • XPS
  • EPS
  • Soft Foam and more!

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