Alvin Bow Compass 
Perfect for use by students or professionals, the Alvin 6" Bow Compass is an instrument of superior quality. It has a fast center wheel adjustment, and a capped spindle to prevent over-extension. The interchangeable pen, pencil, and divider parts make it extremely versatile.
The compass is made of high-tech silver-toned upper legs and black fiberglass lower legs. It makes circles from .125" to 9.5" in diameter. The compass comes in a resealable, see-through package.