Hole saw arbors and pilot drill bits attach to hole saws. Arbors attach to a hole saw so it can be held in a drill. An arbor can be used with hole saws of a compatible size and thread. Pilot bits attach to the arbor inside the hole saw. They drill a starter hole to prevent the hole saw from walking when it starts cutting. Pilot bits are changed when they are worn or damaged.
Hole Saw Arbors
Hole saw arbors attach to a hole saw so it can be held by the drill. The shank end holds the hole saw in the drill. The opposite end attaches to the hole saw and has a receptacle for installing a pilot bit. Hole saw arbors are interchangeable with hole saws that have the same shank size.