Durable bi-metal blades create smooth cuts in steel, stainless steel, nail-embedded wood, plastics and more Use Spyder’s Rapid Core Eject arbor to cut up to 5x faster than standard hole saws — remove cores without prying, cut at an angle, and enlarge existing holes Variable tooth pitch provides a fast clean cut through all material thicknesses up to 1-7/8-in Tough bi-metal steel provides long life in tough drilling applications Universal thread uses Spyder arbor/pilot bits or other universal hole saw arbors