Spyder’s Hex10 1/2-inch Quick Change Hole Saw Arbor and TCT Pilot Bit Assembly helps you get the job done fast. The ¼-inch TCT drill bit powers through cement block, brick and other masonry materials with ease. Spyder's Rapid Core Eject™ arbor system enables you to remove cores without stopping to pry. Simply drill the hole, press the button, pull back the hole saw (sold separately), and eject the core to work up to 5x faster than with standard hole saw arbors. Cut at an angle, and use two adapters (second adapter sold separately) on one pilot bit to enlarge existing holes. Spyder is a trusted and reliable toolmaker that specializes in creating innovative and practical solutions for maximum function on the job. With a focus on quality and functionality, Spyder understands the importance of delivering reliable and user-friendly saw blades, drill bits, and driver bits.