Spyder 13-Piece Bi-Metal Hole Saw Kit Rapid Core EjectSpyders Bi Metal hole saws feature variable tooth pitch geometry and bi metal steel that make them the durable choice for making holes in wood with nails, metals and plastics. Use Spyders 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 (second adapter sold separately) on one pilot bit to enlarge existing holes. All Spyder hole saws