An Annular Cutter, with a center free annulus bell shape, is used to make holes in metal. It is also known as mag drill bits which is named after the use in magnetic drilling machine. Usually, annular cutters are available in Tungsten Carbide Tipped (TCT) and High Speed Steel (HSS).
Depth: One of the cutter size determination. The depth will be longer than the thickness of the material you are going to drill. Diameter: Outer diameter of the cutter. For small diameter holes, you can choose a HSS annular cutter. If you need a bigger hole, TCT annular cutters are recommended. Type of the Material: If you need to drill harder material, TCT or Tin/Tia coated annular cutte