Most Durable Hole Saw. Period;New 3.5 TPI Tooth Design;All Access Slots enhance user productivity by providing best access and leverage to remove material slugs;Increased Pilot Visibility for Accurate Hole Saw Placement;Thermoset Coating reduces friction and drag, increasing overall speed and cordless efficiencies;RIP Guard(tm) Limited Lifetime Tooth Break Warranty;Made in USA;For use in general purpose applications such as thick/thin metals, aluminum, drywall, plastics, wood, wood with nails;1-5/8" Cutting Depth;Plug Jack, an all access slot design for fast plug removal;RIP Guard, the strongest tooth form in the industry