Toolholders type BW/T in carburized and hardened
steel, hardness 60 HRC
to use with counterbore and countersink with front connection from Ø 30 to Ø 40 for the group 1 and from the Ø 50 to Ø 100 for the group 2.
These Toolholders have an high resistance frontal drag-slot,so you can use them for heavy cutting. Weldon Shank