1,Suitable for workpieces that require through-hole positioning and clamping. 2,Compared to traditional internal support fixtures, it can provide parallel clamping, and the centering accuracy can reach up to 0.005mm. 3, Ample clamping space, adaptable for the loading and unloading of workpieces by robotic arms. 4, Internal expansion of the workpiece while pulling it back, ensuring accurate axial positioning.