Safety Technologies

Concealed blade:

This is probably the most secured method as it is nearly impossible to cause injuries while cutting with the none exposed blade. But this method is primarly suitable to cut foil, sheets of foil, sheets of paper and similar.

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Automatic blade retraction:

This safety mechanism is automatically triggered once the cutting process starts. On contact loss with the material the blade retracts fully automatic and out of control from the user into the knife body. This technique is very safe and reliable.
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Spring loaded blade retraction:

This safety mechanism must be deliberately been activated by the user by withdrawing the thumb off the slider. Only then the blade retracts on contact loss with the material automatically into the knife body. This technique is very effective – but not the most secure.
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See ALSO

Replacement Safety Knife and Cutter Blades can be found here