The PRO-SERIES 19-Piece Hole Saw Blade Set contains 13 hole saw blades so you can tackle any job around the house or on the job. Use these 13 blades to cut clean, smooth holes in drywall, plaster or wood. All 13 blades and accessories are packaged inside a plastic storage case so they will be easy to find when you need them. Includes 13 hole saw blades ranging in size from 3/4 in. to 5 in. A 1/4 in. Drill Bit is included for making start holes. 2 mandrels, 1/4 in. and 3/8, with a mandrel drive plate, fits most major brand saws. A hex wrench is included for easy blade changes.