What is specifically defined as 1/48th of an inch?

Question
What can be dipole, loop or helical?
Answer
Aerials

Question
What is the main ingredient of faggots
Answer
Liver

Question
FINA is the governing body of what amateur sport?
Answer
Swimming

Question
Who is the boss of UNCLE?
Answer
Mr Waverley

Question
Name two self cleaning organs?
Answer
Eye Vagina