In terms of what other units? This is a very ambiguous question. The only definitive answer I can give you is, that it is NOT thick enough to pleasure a girl; that's for sure.
239 inches
.1406 inches or 3.57 mm thick. (USG)
It is the same as 5.5cm which is about 2 inches thick
0.5 inches thick
Not thick enough.
.1250 inches or 3.18 mm
18 gauge steel is typically 0.0478 inches thick.
It is 1.524 millimetres thick.
.0762 inches
about 4 inches thick
about 3 inches thick
3.9 inches