This is a very solid Brown and Sharpe 24" Hardened adjustable square. It has a protractor built in to the rotating mechanism. This is a used item that was from my relative who was a machinist. It is used as can be seen in the pictures but still very good condition. It is hard to find the 24" long ruler square. This is a true machinist tool! Please ask any questions before bidding. Shipping will be $15.00 to anywhere in the continental US.... (It is heavy and long). If you live in the Chicago area, you can pick up the square and save the shipping.