Toolholders Type B/W Polledri Srl Toolholders type B/W in carburized and hardened steel hardness 60 HRC. You can fit them rapidly all the interchangeable counterbores an countersink Polledri of the same group. Weldon shank. INTERCHANGEABLES TOOLHOLDERS WELDON SHANK INTERCHANGEABLES SYSTEM, TOOLHOLDER, WELDON SHANK 05/10/2023