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An X-Acto knife equipped with a "Number 2" blade Parts of an X-Acto knife from left to right: (1) handle, (2) collar, (3) collet, (4) blade. An X-Acto knife is a blade mounted on a pen-like aluminum body. A knurled collar loosens and tightens an aluminum collet with one slot, which holds a replaceable blade.
OLFA Corporation (オルファ株式会社, Orufa Kabushiki-gaisha) is a Japanese manufacturer of utility knives, founded in 1956 in Osaka, Japan. The name is derived from the Japanese words oru (折る, bend and break) and ha (刃, blade). The company is known for inventing the snap-off blade and the rotary cutter.
Some use standard blades, others specialized double-ended utility blades. The user can adjust how far the blade extends from the handle, so that, for example, the knife can be used to cut the tape sealing a package without damaging the contents of the package. When the blade becomes dull, it can be quickly reversed or switched for a new one.