Surgical Acorn burs can be used in a variety of surgeries where conical shaping is required. Acorn burs are different from round burs in that they have a conical tip for pinpoint cutting and shaping. The standard length of the A6070 bur is 70mm straight shaft with a head size of 6.0mm. 8 flutes on the Acorn head help remove excess material smoothly and efficiently. Omega?s Acorn burs are made from medical grade stainless steel. All our burs are manufactured right here in the United States.