Hey - I asked, I'm the audience, I understand 1 1/2"!
I doubt they were actually precisely 1 1/2" unless Janice used a calliper to measure them. Could round that 3/4 milimeter up and make it 32 mm, or even 3.5 cm. ...Hey, using my calliper, I get 1 1/2" equals 38.2 mm, not 31.75. (And what's this confusing European habit of using a comma in place of a decimal point all about?
I'm still waiting for a German speaker to confirm or correct the translation I attempted.