GHL High-precision Hydraulic Rotary Chuck - Rear-pull Type

It has a small outer diameter for installation and a large through hole (with a diameter of 20mm).

GHL-25 Hydraulic Rotary Chuck with a Large Stroke

The chuck is designed with a central through hole and is equipped with a large stroke design for the automatic feeding system. The opening stroke is 2.5mm, and the through hole can clamp up to 25mm.