Neiko 00817A Professional Grade Bi Metal Hole Saw Kit, 9 Piece Bi metal composition of the hole saws allows it to be compatible with many materials while cutting smoother and faster with reduced vibration Hole saw kit comes with many sizes allowing you to perform electrical work, plumbing, and even light fixtures Designed with side slots for easy and quick slug removal Set comes with a cushioned case for easy and safe storage when not in use Set includes: six hole saws ranging from: 22, 29, 35, 44, 51, and 64mm (engraved labeling), two adaptors: 7/16" and 1/4" hex and a mandrel adapter