COUNTERBORES WITH 3 FLUTES

Counterbores with 3 flutes type H-H/T group 0-1-2 in hard metal quality ISO K 30 from Ø 10 to Ø 85.
Helix angle 5°. You can fit them in all the Polledri holders of the same group. These counterbores are manufactured
to solve all the problems of counterboring head screw and spot facing on cast iron, bronze etc. With rotatory
pilots or drills you can execute simultaneous operations.
We advise them for materials with short and normal chip.