Fiskars Paper Trimmers

It is simply impossible to make a genuine straight, right-angle cut on paper using a scissors, or even a razor blade and straight edge. The old guillotine paper cutter could deliver a clean cut, but at the risk of taking your fingers away. Fiskars, the scissors makers, invented a tiny blade mounted on a hinged holder that zips through material without any possible harm, even to the youngest children. It’s fast, accurate, and crisp.

-- KK  

Fiskars Personal Paper Trimmer
$10, 12 inches wide

Available from Amazon