Cutting film for archiving

A simple question: how do you cut strips of film for archiving? I keep my negatives in plastic sheets that fit in a standard three ring binder. Each "row" on a sheet holds five frames, therefore i cut my strip of negatives into segments of five frames. I usually use sicsors to cut the negatives at the appropriate place, but this often makes for sloppy results. And, although it hasn't happened yet, i worry that I'll eventually cut into the frame of my negs. How do the pros and film processing places cut their negs in nice clean lines? any recommendations are appreciated (even if this means recommending a certain brand of sicsors).

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