Bi-metal Hole Saw Assortments. These assortments include the most popular sizes of Hole Saws, with Arbors and Drills , Bi-metal Hole Saw Assortments. These assortments include the most popular sizes of Hole Saws, with Arbors and Drills , for general purpose use, and come in a sturdy, durable plastic case that's compact and easy to handle, choose the assortment best-suited to your needs.