Spyder's TCT hole saws cut more materials, faster and last longer than conventional bi-metal saws. Use Spyder's 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 fit on spyder rapid core eject arbor/pilot bits and on universal hole saw arbors. Up to 10x more cuts and 5x faster than standard bi-metal hole saws - effortlessly eject the core with the push of a button.