Table Leg Extender

Dimensions:Bottom - 58mm wide x 15mm highTop - 58mm wide x 3mm wall x 10mm high My problem wich ended with this project:I bought an old tabel and some old chairs, but the chairs couldet go under the table.I designed a circel in TinkerCad with a diameter on 58mm wide and 15mm in height.On top og that i made a circle with a hole in the same diameter of 58mm and set the wall for 1 which made it 3mm wide, so it wont brake off, so the hole is 55mm wide. I made the wall 10mm high, so the extender work