Simply buy Insulation knife with 1 blade, 140 mm long

The Milwaukee FASTBACK folding utility knife and blades set includes the FASTBACK folding utility knife with blade storage and 50 piece general purpose utility blades. The FASTBACK folding utility knife with blade storage features a press and flip mechanism for one-handed opening. This press and flip open utility knife offers tool-free blade changes for fast blade swaps with a metal extension over the button to prevent accidental blade removal.

Milwaukee Fastback Compact Folding Utility Knife with General Purpose Blade (12-Pack)

Simply buy Insulation knife blades set, 5 pieces, 140 mm long

Insulation Knife

TOUGHBUILT Insulation 1-in 1-Blade Utility Knife in the Utility Knives department at

Fiberglass Insulation Knives

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Insulation Knife + Sheath — TOUGHBUILT