Bi-Metal Hole Saw Kit, SUNGATOR 18-Piece General Purpose 3/4" to 2-1/2" Set with Case. Durable High Speed Steel (HSS). Fast Cut Clean, Smooth and Precise Holes Through Metal, Wood, Plastic, Drywall. -
Amazon.com: Freud DHS17SPL Bi-Metal Plumbing Set (17 Piece) : Tools & Home Improvement