Durable bi-metal blades create smooth cuts and last longer 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 guarantees 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 5/8-18 thread uses Spyder Hex10 arbor/pilot bits or other universal hole saw arbors.