The burnishing drill has four margins which stabilize it as it is drilling.
The two extra "Burnishing" margins also help to smooth the hole after the "Cutting" margin has cut, giving the hole a better finish than a conventional drill. They also help to make a hole that is consistent from one to another. Because the

We offer precision-engineered solid carbide burnishing reamers in a wide range of sizes. These need high spindle clarity and speed for its usage. The added advantage of our burnishing reamers over other is its minimum deviation of hole axis, high quality surface finish, specially for finishing of short chipping materials like