Knipex have 4 ranges the standard red handled ones the blue and red handled one for comfort grip non VDE, The red and yellow ones as mentioned above which are VDE rated and finally the S range which is entirely red which are aimed more for the professional, still they are a little bulky for me so I use the red and yellow ones. The link shows all the range.
The blue and yellow are insulated for temperature ranges as well as voltage, making them more comfortable to work with in extreme weather. Yellow and red is insulated solely for voltage.
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