Though Faber-Castell makes a remarkable pencil holder and extender, the market has a good deal of room for less expensive offerings. One of these is the pencil holder from Tohkin.
From their website, it appears that Tohkin is a specialty pen clip manufacturer in Japan. This pencil holder seems to be a natural extension of their clip business.
The chromed unit has two extra features that distinguish it from other inexpensive pencil extenders – an adjustable spring loaded clip, and a giant eraser. The clip can be moved up or down the extender barrel. I suspect the eraser could be replaced.
Even the default included pencil is good quality. I would say it is a useful and usable accessory for three dollars and change.