The only truly self-centering ones, used like adapters mounted on a smooth or expanding carrier shaft to block larger diameter cores.

When the air tube is inflated the axial expansion pushes out radially circular sectors that perfectly center the chuck into the core.

The radial expansion of the air tube blocks the core that by adherence transmits the torque.

Available for cores with inside diameter ranging from 100 mm (4″) to 300 mm (12″)