Polledri Three Flutes Counterbores Solid Carbide 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 […]