Durable solid steel construction provides years of long-life performance that will not deflect under pressure of drilling. With a hybrid flat hex setscrew in the body, it provides a tight fit to withstand vibration but provides ease of replacement of setscrew with use of common flat head screwdriver. 36-574 quick-change arbor saves valuable time by allowing quick-change of hole saw sizes without the need of tools and without having to remove the arbor from the chuck.