It is unknown.
27 inches
In the US it's inches, but buy based on width, not length.
50 cm is equal to 19.685 inches in US length.
5.88 inches, a bit less than the length of a US dollar bill.
Inch is a length unit not an area unit.
178.3 inches...4530mm
18 inches and a total overall length of at least 26 inches, just like in the rest of the US.
This refers to the measurement of a standard bar stool which is 24 inches. Therefore it is talking about the measurement inches and about the typical bar stool length.
20 inches
LENGTH and WIDTH
Wallet
Inches if you are in the US, centimeters or millimeters everywhere else.