I would like to know the size of the base of a grohe concetto kitchen tap 32661001

Google the model for specifics but the standard granite is 1 3/8"

Thanks ma0641

Probably my question was not clear enough!
I need to change the tap on my kitchen sink and I really like the grohe concetto32661001 .
I have checked the specifications from Grohe and I cannot see anywher the size of the base of this tap.
Basically I need to know the diameter of the base in centimeters to check if it fits on the hole of the sink I already have.

Thanks ma0641

Probably my question was not clear enough!
I need to change the tap on my kitchen sink and I really like the grohe concetto32661001 .
I have checked the specifications from Grohe and I cannot see anywher the size of the base of this tap.
Basically I need to know the diameter of the base in centimeters to check if it fits on the hole of the sink I already have.

If Grohe can't tell you I can't either. You can't find one in a store to measure? I just had a new granite counter put in and they drilled 1 single hole, never asked the size, fitted perfectly with a Delta faucet.