A all purpose all steel square. In it's standard form it is a rightangle and a mitre square, and with an additional bases it is a muliti-angle bevel or protractor and a tool to find the centre of bar stock.
The Vancouver Tool Library Cooperative
http://vancouvertoollibrary.com/
3448 Commercial St.http://vancouvertoollibrary.com/
Vancouver, BC, V5N 4E8
Canada
604-568-8071