Engineered for efficiency and durability, the Plumber's Bi-Metal Hole Saw Set features a unique double-tooth design that optimizes chip removal and extends the life of the blade. The high-speed steel edges and bi-metal construction are suited for general purpose drilling and work effectively on a variety of materials including wood, metal, and plastic. The deeper design can cut 2X lumber in one pass and makes it easier to cut thicker materials, for a max drilling depth of 1-3/4 in. The larger slot provides extra levera™ge for removing plugs. This set includes 7 hole saws and 2 quick change hole saw mandrels.