The Milwaukee® 2-1/2" Hole Dozer™ With Carbide Teeth Hole Saw Features A New 3 Tpi Design That Offers Fast Cuts With The Durability Of A Bi-Metal Hole Saw and Life Of A Carbide Hole Saw. This Milwaukee Hole Saw Provides The Longest Life In General Purpose and Extreme Materials With The Ability to Cut Through Stainless Steel, Cast Iron, Fastener Embedded Wood, Cement Board, Fiberglass, Plaster, Asphalt Shingles, and More With Ease. Deep Gullets Clear Material Fast While Cutting, and Milwaukee'S All-Access S