Convenient for small sinks bungs

I had a hard time finding a filter for my little sink drain (diameter 4 cm inside). This is fine. The flexibility of net allows to adapt even to a little quirky sinks (mine tightens inside ...), bending slightly the grid.
Small cracks completely stop everything, too, since sometimes be cleaned under water (and therefore refer in the sink ...) smaller pieces stuck in the net!
In any case, this filter completely satisfied with the purpose for which I bought.