Sink Tweak diameter- 110mm.
Tub Tweak diameter- 70mm.
The DOMESTIC DEAL as no shipping cost
US backers has no shipping cost.
Yes the tweak stays in place inside the sinkhole. The tweak is made out of silicon, which create a lot of friction with the drain hole, and keep it into place.
Yes, shipping inside israel cost money.
Don't see the answer to your question? Ask the project creator directly.