Spyder's Tungsten Carbide Tipped (TCT) hole saws cut more materials up to 5x faster and make up to 10x more cuts – lasting longer than conventional bi-metal hole saws. Use with Spyder's Rapid Core Eject arbor system to remove cores without prying - drill hole, press button, pull back the hole saw, and eject the core. Cut at an angle and use two adapters on one pilot bit to enlarge existing holes. All Spyder hole saws fit on Spyder Rapid Core Eject arbor and pilot bits (sold separately), and on universal hole saw arbors. Spyder’s TCT hole saw is the Pro’s choice for innovation, high performance, speed, and versatility – drill more holes in more materials in less time.