Wilson Combat^® Extractors are fully machined from solid bar stock, then heat treated to provide optimum tension and long service life.  The result is an extremely durable extratctor that will hold its tune without constant tension adjustment.  They feature an extra deep hook for maximum strength and contact with the case rim.  A high quality, properly adjusted extractor is quite possibly the most important component in a 1911.  Don't settle for anything but the best, Wilson Combat^® Extractors.