Up to 10x more cuts and up to 5x faster than standard bi-metal hole saws Spyder’s Rapid Core Eject arbor system ejects cores without prying, quickly changes diameter, cuts at an angle, and enlarges existing holes Drill wood, MDF, plywood, fiber cement board, porous concrete block, some brick, ceramic wall tile, plastic, PVC and more Tungsten carbide tipped for extended life, clean cuts and extreme material drilling versatility Universal thread uses Spyder arbor/pilot bits or other universal hole saw arbors