DEWALT D180005 14-Piece Hole Saw Kit TOOL USES: Convenient sizes for plumbing, electrical, and door-lock installation tasks DEEP CUT STYLE HOLE SAWS: Deep-cut style hole saws for improved efficiency and versatility DURABLE: High-speed steel height and double-tooth design for increased durability HARDENED BACKING PLATES: Hardened backing plates to prevent warping and thread stripping INCLUDES: 11 hole saws, a small quick-change mandrel, a large quick-change mandrel, replacement parts, and case