Tip part of sampler horn.
For the Hayabusa2 improvement, the edge of the sampler horn was folded back inward.
Sand gravel can be hung on the cuff (gravel of 1 to 5 mm can be captured).
If the explorer makes an emergency stop during its ascending, gravel will keep
going up to be stored in the catcher. This mechanism is a backup for sample retaining.
Details : JAXA Digital Archives
Credit :JAXA