Description
A Burnishing drill generally has straight flutes and multiple stabilizing margin edges with a thinner pilot section at the tip that is followed by an extra set of burnishing margins. This allows very accurate sizing of the hole and the burnishing margins create a very fine finish on the inside of the hole. These drills are extremely precise when you need multiple holes that are very close in size to each other as they tend to be more rigid and do not deform under load as twist drills do.
