Single-hole sharpener has one sharpener for standard-sized graphite pencils up to 8.2 mm. in diameter. Double-hole sharpener has two sharpeners, one for standard-sized graphite pencils up to 8.2 mm. in diameter and one for thick graphite and colored pencils up to 10.2 mm. in diameter.
i love this pencil sharpener... threw out the electric one
It is a great tool to have it on your drawing desk. It is easy to handle, and no mess after using it. A must!!!