Why "KNOCK" Flat Base ?
After the first press of the espresso, a light knock is made on the side of the filter holder.
"knock", which causes all espresso powder to fall into the portafilter from the side. Then there is another tamping. So that the tamper base does not have to be used for this light blow to the portafilter, which could damage the soft portafilter, or even the wooden handle, you can now knock with the silicone ring incorporated into the base.
You need to order handle separately for this Tamper Base!