Annular cutters work best in drill presses or mag drills, especially for holes large than 1" in diameter in metal thicker than ½".” ...

3/4" Weldon shank with 2 flats - fits most major brands of magnetic drills, can also be used with machine tools such as mills and large drill presses with tool holders. Can widely used in drilling ...

[Workshop From Scratch] was having issues with his drill press, and solved them with this ... The first was having to make a large number of adjustments up and down when working on larger pieces.