Jakar Plastic Cutting Knives come with snap off blades to ensure that the knife remains sharp for a long period of time without the need to frequently replace the blades.
They are ideal for heavy duty cutting and cutting into deep surfaces such as foam board as the blade can just be extended further then snapped off when blunt.
These knives are easy to use and blades are easy to change. The large knife has 8 snap off points and the small knife has 13 snap off points.
Replacement blades come in packs of 5. Very sharp - handle with care.