Toolholders Type B Polledri Srl Toolholders type B in carburized and hardened steel hardness 60 HRC. You can fit them rapidly all the interchangeable counterbores an countersink Polledri of the same group. Straight shank. INTERCHANGEABLES TOOLHOLDERS CYLINDRICAL SHANK CYLINDRICAL SHANK, INTERCHANGEABLES SYSTEM, TOOLHOLDER 10/03/2020