Paul asked: 


> I thought these too where parts for a plane, but then saw
> the L. S. Starrett mark and new otherwise.

> Any idea what they are called and used for?


Stair gauges. They clamp on a framing square to act as stops when laying out
repeated angles, such as when laying out stair Stringers.  #111, http://www.starrett.com/metrology/product-
detail/111">http://www.starrett.com/metrology/product-detail/111


*** This message was sent from a convenience email service, and the reply
address(es) may not match the originating address