Starrett Fast Cut Kwik Change Electricians 3 Piece Kit
This Kit Contains:
20mm Hole Saw, 25mm Hole Saw, and a 32mm Hole Saw.
It also contains 1 pilot drill and a chuck, 2 a6 Hole saw arbors and 1 a3 Hole Saw arbor.
It is a quick-change system with a hexagonal shank.