It is nothing special, it plays in a 58cm shutter and does not stay stable. It is a simple gadget, when you cut the coffee and put it in the closed one, the coffee does not fall.

Cutting off one star due to its price. It is expensive, even though the rhino has double the price. My question was answered. It fits well on a 58mm portafilter. Of course, in my Macap doser grinder it doesn't fit upright in the hole where the coffee comes out, and I have to remove the spring that holds the portafilter, but this is not significant enough for all buyers to cut off another star. Satisfied, but it should be cheaper...
Update
I cut off another star because if you shake the portafilter to settle the coffee before removing the doser, if you press it, it goes inside from one side and trying to remove it when it's stuck, the coffee spills. It's a shame for the company (Motta)

Although it does not fit exactly on a 58mm portafilter, it is very practical and has good construction. I recommend it.

I bought it to grind coffee in it and transfer it to my portafilter (58mm - Lelit). Unfortunately, it doesn't fit properly (it's smaller than it should be), resulting in the need for careful handling to prevent coffee from spilling out.