For that mater, the slimmer X-Acto handle (the number 1, uses #11 blades) is only as thick as a pencil. They are soft aluminum, so you can trim to fit. The bigger handles, the #2, is the same material, but a bit chubbier- I'd say it was worthwhile to use that, and the bigger/longer blades.
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-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.