#1 & 2: 'Bearing' is so spelt. 'Mar' is the wrong verb choice. #3 & 4: OK and synonymous #5, 6 & 7: #5 refers to a single instance; #6 and 7 are roughly synonymous (#6 is casual).
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messier42Did I use the word ' mar ' correctly?Yes, those are nice.
messier42Is 'mar' here totally wrong?No, I think that it says what is meant: those pliers do not mark or scuff the wire insulation.
messier42So, it's used as 'deface'Yes, that's the more usual meaning.