10pcs metal hole saw

A typical 10-piece set includes the following:

1. Hole Saws (7 to 8 pieces): These are the circular blades themselves, in a range of common sizes.
2. Arbor/Mandrel (1 to 2 pieces): This is the shaft that connects the hole saw to your drill chuck. A set usually includes one or two arbors to cover all the included saw sizes.
3. Pilot Drill Bit (1 to 2 pieces): A standard drill bit that mounts in the center of the arbor. It drills a small initial hole to keep the main holesaw perfectly centered as it begins cutting.