Spyder's carbide-tipped Tarantula hole saws cut the toughest materials including steel, stainless steel, wood with nails, plastics/PVC, non-ferrous metals, fiber cement board, fiberglass, mineral fiber, and more. Durable tungsten carbide cutting teeth make up to 50x more cuts than conventional bi-metal hole saws, and they are up to 10x faster — making clean cuts through the toughest materials and extending bit life. With Spyder's Rapid Core Eject arbor assembly you can remove cores without prying (drill hole, press button, pull back the hole saw, and eject the core), cut at an angle, and enlarge existing holes using two adapters on one pilot bit (additional adapters and pilot bits sold separately). Universal 1/2-20 thread uses Hex8 arbor/pilot bits or other universal hole saw arbors for a maximum cutting depth of 2-3/8-in. Using a drill motor with a support handle is recommended. Not for use in hammer mode or on harder, more abrasive materials. The Tarantula Hex8 hole saw collection includes hole saw sizes 7/8-in, 1-in, 1-1/16-in, 1-1/8-in + Hex8 (3/8-in) complete arbor assembly.