Polledri Interchangeable Counterbores 2 Flutes with Insert type HI-HI/T group 0-1-2 in hardness and tempered steel with hardness 42 ÷ 45 HRC, from Ø 18 to Ø 60. Helix angle 7°. You can fit them in all the Polledri holders of the same group. With fixed or rotating pilots, or drills you can execute simultaneous […]