TTF: Tool design family identifier (Refers to an external face grooving and turning tool system that cuts into the face of a component parallel to the lathe spindle
R: Hand orientation (Right-hand cutting direction)
2525: Shank size (A heavy, square cross-section tool shank measuring 25 mm wide by 25 mm high, offering high structural rigidity to damp plunge vibrations).
-4MM / 4C: Insert pocket size (Precision-milled to rigidly secure indexable parting, grooving, or face-turning inserts with an exact 4.0 mm nominal cutting width).