Starrett C434ME-300 Forged， Hardened Square， Center And Reversible Protractor Heads With Blade Combination Set， Smooth Black Finish， 300mm Size<img src="http://ecx.images-amazon.com/images/I/410lLXf%2BX%2BL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51DaUd0GRzL.jpg" noproxy>