I used to frequent flea markets to build up my collection of woodworking tools and on my list of things to find was a Speed Square. But I didn't have the patience to wait for luck to get me to the Speed Square Sale and the price of this one was right so I ordered it. Although cast in plastic, all edges were perfectly flat and free from manufacturing defects and seem strong enough to withstand the measurements and drawings I had planned for it. looked bent out of a square. I'm glad I went with it.