pencil talk

Image used courtesy of isu at the uncomfortable chair.
The Tortoise Lead Pointer is a remarkable all-in-one unit for blade sharpening of leads. It can handle:
1.18mm: Traditional mechanical pencils (pre-1950?), and today, Yard-O-Led, some Autopoint, and some Retro 51 pencils.
2.0mm: A standard lead diameter.
3.15mm: A standard lead diameter.
3.8mm: Less common – used by the Pilot Croquis, [...]