Spyder's Bi-Metal hole saws feature variable tooth pitch geometry and bi-metal steel that help them cut through nail-embedded wood, metals, and plastics with ease. Pair them with Spyder's Rapid Core Eject arbor system for fast, hassle-free core removal. Simply drill the hole, press the button, pull back the hole saw, and eject the core. The Rapid Core Eject system also makes it easy to cut at an angle or enlarge existing holes using two adapters on one pilot bit. All Spyder TCT, Tarantula, and Bi-Metal hole saws are compatible with Spyder Rapid Core Eject arbors and pilot bits, as well as universal hole saw arbors. This 11-piece kit contains 7 hole saw bits (3/4, 7/8, 1-1/8, 1-1/2, 2, 2-1/8, and 2-1/2-inch), 2 pilot bits (Hex8 and Hex10), 2 arbors (Hex8 and Hex10), and a hard storage case.