Malco DK6S Double Edge Duct Knife in. Repalcement for DK1 in.

Malco DK6S Double Edge Duct Knife
For cutting flexible fiberglass wool duct and ductboard. Double edge blades are ideal for blind cuts in "flex" duct. Ergonomic cushion gripped model features one serrated cutting edge and comes with a puncture-resistant nylon sheath.
Wood handled model is a fine grained walnut.
Both knives feature resharpenable