The stainless steel flat Ring packing, which is called QH-1 or Super Mini Ring for short, is used for liquid-liquid extraction in low interfacial tension system. The axial mixing is small, the treatment capacity is large, and the mass transfer efficiency can be increased by more than 20% The pen load can reach 50 ~ 60m 3/(M2.h) when used in liquid-liquid extraction of medium interfacial tension system The packing can also be applied to gas-liquid mass transfer process. The features of the metal inner-bending Arc Rib Angle flat ring are: low resistance to fluid, gas supply, large surface in liquid contact, which has improved the fluid mechanics and mass transfer performance of the packing. Therefore, the metal inner-bending arc rib corner flat ring filler is a kind of filler with high flux, low pressure drop, high mass transfer efficiency and large operating flexibility.