Secure straight-shank cutting tools with high clamping pressure and excellent structural rigidity using heavy-duty OZ Collets. Precision-engineered according to strict DIN 6388 / ISO 10897 standards (frequently known as Ortlieb system collets), these robust spring collets feature a shallower taper angle compared to conventional ER systems. This unique geometry yields massive radial force and superior gripping power, making them highly effective for holding larger diameter end mills, drills, and heavy-duty routing tools during high-torque CNC milling and aggressive metal-cutting operations.